There is no need for a new ECU, I did this same conversion and by the advice of a Suzuki tech he said the stock ECU would adjust to the added airflow and it did, runs great. Only parts you need are the flame arrestor on seal
@@kitkat101 No issues, I've been checking the spark plugs and they look good, no signs of running too rich or too lean so the ECU is doing it's job. You will need a new prop tho, I got an 11 pitch, the stock prop on these are horrible anyways so budget for a prop as well
with the new found torque, you can install a 12 or 13 pitch prop and get significantly more top speed out of that motor now.. Probably closer to 28-29 mph
We used to do that with a 6hp Mercury cover on a 15hp Mercury, just to fool the police, my little Zodiac Cadet 310 used to go over 50kph with that 15hp Mercury, the whole boat and motor combination weighed like 90kg with a full 24 liter tank.
@@Dark30Outdoors Try putting the original control module in and test the speed and acceleration just by removing the air restrictor. ? ? ? Will it run a little bit better or a little worse or alot worse?.
Hi there, I have since been told the ecu does restrict the rev limit. The 9.9 revs to 5800 the 15 to 6000 and the 20 to 6200 that's how some of restriction works
@@SynicalBeats not really as silicone spray stays slippery, where as windex and/or soapy water dry. Thus the rubber still offers support via friction. In most cases like this I use Saliva (yes I spit on it 🙂)
I upgraded my 15 to 20, if I knew what I know now, I would have just bought the 9.9 and upgraded it. Others have mentioned changing the prop, but when I looked it up, the standard prop was the same for both. Haven’t had it out on the water yet, but it runs fine on the Mickey Mouse hose fitting
If I was doing this I would check the ignition advance between the two models and the injector size. If there the same spec I would say its the washer between the airbox and the throttle body, that is restricting down to the smaller hp
Man! Your video was awesome thank you. I’m soon to get the Suzuki 9.9 2022 4 stroke short shaft. Thank you for sharing that. If I ever have the need to up it to 15hp or 20. I now know how to do it. So amazing again thank you. Your video was super informative. Great job.
Looking to do this to a Mercury 9.9 EFI. The parts seems to be the same between the 9.9/15/20 EFIs, except for the ECUs and restrictors on the 9.9/15. Hope it'll be this easy for me.
@@Dark30Outdoors Yep, it was very similar, and worked. The ECU was a little harder as I had to remove the lower cowling a bit since the electric starter take up some room above the ECU so I couldn't pull it out without some more space.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
@@Dark30Outdoors Here is a description of how to flash and the firmware file from a 20 motor with manual starter. drive.google.com/drive/folders/1hAlZkspz57omBZYWyYuO9dZ9kTFsA9RR
@@Dark30Outdoors Bro, I can also give you a suzuki sds diagnostic program to diagnose the motor. All you need is a Chinese k-line adapter for 8-10$ and PC win xp-10.
All marine gasoline engines should have a flame arrestor on the intake. Especially an inboard or I/O. You have never seen a backfire (and it's not a noise from the exhaust)?
The reason this works for Suzuki is because the 9.9 and the 20 are the same motor with different intake controls. They both weigh 108 pounds in the long shaft version. But other manufacturers have different approaches. Example Tohatsu offers a 9.9 that weighs the same as their 20. They also offer a 9.8 that is significantly lighter. The 9.8 weighs 80 pounds. If you are frequently using a portable on a dinghy from a larger vessel, the difference in lifting 80 pounds or 108 pounds is significant. It magnifies when mounting to a dinghy in a rolling anchorage. I only post this to highlight the differences between the 2 brands. I have a Tohatsu 4hp on a small boat and a Yammy 175 on a slightly bigger boat. I don't own a Suzy.
@@Dark30Outdoors Thanks for the thumbs up. My comment was nothing against your post. The upgrade is awesome and probably less expensive than the 20. I was just thinking of different applications which have different priorities. As a young man in his 70's, weight is becoming very important.
This is true - most, if not all 9.9s are restricted versions of the 15 or 20hp. The manufacturers do this across their lineups - I think your yammy is the same engine as the 200, just without vvt PS: 70 ain’t nothing young lad!
The Tohatsu 9.8 is smaller cc than the 9.9. The 9.9hp Tohatsu is same engine with the 15hp and 20hp versions, they also have different restrictors and ECU's, so from the 9.9hp you can get 20hp out as well.
Interesting to see if it uses less fuel at the same speed without that restrictor. In a similar thing where the manufacture limited the power output for the same engine, I had a Cub Cadet with a Kawasaki engine that went from 22hp to 25hp by just allowing the throttle butterfly to open fully.
GM used to limit the throttle valve opening angle on some cars when they had corporate edicts on the amount of power for that size car. One of the first buff-book recommendations was to have someone fully depress the accelerator pedal while you stared down through the top of the carb - of course with the engine off and air cleaner lid removed. If you saw the throttle plate wasn't going vertical, you could look for what was stopping it short and remove that restriction.
9.9hp engines are tailor made for specific markets and regulatory rules. like in the EU the maximum engines kids under 16 can use is a 9.9hp engine. Easier to downgrade an existing engine design to meet the hp requirement than making a whole new engine.
You don't have to wait, why should you have to wait? If you have a new control box with the firmware from the 20th motor, you can safely change it right now, no one will know about it. If the motor breaks, just put everything back in, you can wear gloves so you don't leave fingerprints.
My question to you and anyone in the group who completed the upgrade to either 15 or 20hp is whether a noticable increase in power was noted at low to mid RPMs, or only at the high end because the WOT max was increased? For example would I expect to have greater speed (and therefore greater fuel consumption) at say 3500RPM (my expected typical cruising speed) after converting to 15 or 20hp? Thanks!
Not sure. For this project, the 2 different motors are the same except the lower hp one reduces fuel flow with a restrictor plate and then uses a different EFI module. Something you could look into.
Typically all 20hp engine families are the same factory tuned up 15hp, or 9.9 (if EFI). But more than 20hp are a completely different larger engine family so no, its not possible. In the smaller 4-stroke outboards, typically the same engine families are grouped as follows; 4, 5, 6hp 8, 9.9 9.9, 15, 20 (Merc & Suzuki only) 15, 20 40, 50, 60, 70 75, 90, 115
Thanks, but I only saved around $40 or so. Though, technically I have an OB motor I can run as 9.9 or 20 hp. Also it says 9.9 so it’s valid on lakes that are 10 hp or less.
You mentioned that your 9.9 is 2021. So is mine, so because I see at least a few ECUs with different part numbers can you tell me which one you installed? For example 33930-89L20, or 33930-89L30, or 33930-89L40 ? The part#s for the flame arrestor and seal are straightforward. Thanks!
@@Dark30Outdoors My model has elect start, remote/non tiller, power tilt and is, I think, different than yours so I'm unsure whether a different ECU is required or not for those features. It's an expensive decision to get wrong if it cannot be returned. Maybe I need to locate a 2021 DF20 with same features as mine and figure out what ECU is installed. Or maybe I'll just do the 15hp upgrade using a bored out restrictor plate and leave it at that. Decisions decisions!!
One could get most of the performance for free by just removing the restrictor. From what I've read the only difference between the ECUs is that the 20HP one allows an extra 500RPM before the rev limiter stops it so you'll get all of the acceleration of a 20 and just not have the same top speed potential. Putting the right prop on it will probably be worth more than the ECU swap without a re-prop.
That’s awesome that you can upgrade by 10 HP that easily and for less than $500. Sweet ! Wonder if I can upgrade my Johnson 15 hp to a 30 as easily. Something to look into. 13 mph up to 21, yeah that’s a great upgrade and getting on plane that much quicker. Good job Kyle !
If your Johnson is a 4 stroke that is fuel injected then it might be possible. The only other model that I have heard of people doing it on is the Yamaha.
Is there a specific range of 'yrs' these 4 stokes accept the parts he made reference to? I love the idea, something way to 'stick it to the man' price gouging boat registration fees for 10 and over.
It should definitely work for any Suzuki 4 stroke outboard 9.9 that uses this electronic fuel injection system. I'm not certain of all the years that use this same system, but I'm sure that information is out there somewhere!
@@Dark30Outdoors Ok now I have a plan. What ever yr the motor is, I will compare the 'part numbers' for the specific parts, before I purchase the motor. The main objective of the mission = more horsepower for almost free. Yay (and fooling the man)
@@renegademind1833 the value of the parts swap is very close to the value of the 20 hp motor. I have lakes restricted to 10hp or less and my motor shows itself as a 9.9! :D
So latest 9.9 efi tohatsu outboard is at 84.9lb so by changing parts to 20hp it still remains at 84.9 lb ...which is nice because at stock 20hp tohatsu, weight of engine is at 104lb...so ur saving 15lb of weight. Question is, 15lb of weight, is it worth all the hassle? Or is it just better to buy 20hp outboard?......
Would this be the same ECU for a 9.9 that has controlls instead of a tiller motor? I was not able to find any info only manual and electric start. No mention of motors with controlls. Thanks!
I'm not sure. I would think they would be the same, but I don't know for sure. If you called an official parts dealer I'm sure they could tell if you if the part numbers are the same or different!
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
Those links are Amazon links and the parts aren't on Amazon. The part numbers are listed in the description. You'd have to order through a Suzuki parts dealer.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
I'm not sure. I know the 9.9 and the 20 HP that Suzuki makes use the exact same housing, and really everything is the same except for those 3 simple parts!
That was very cool brother! I can't believe it was that simple! In your opinion is it better to do that or bye a 20 hp from the start and what would be the price difference? Thanks for sharing my friend!
I think it was maybe $100 cheaper converting it, but technically I can run my OB motor with 2 different configurations! Plus, here in Ohio we have lakes that are 10 HP or less. Well my motor is shown as a 9.9!
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
Did you buy the parts direct from the Suzuki dealership in the US or did you get them from your local boat shop? I was looking into doing the mod if I ever came across a second hand Suzuki 9.9 HP outboard but I wouldn't know where to look for the parts.
Mine is a 2021. I’ll see if I can find the model number. Might be in my unboxing video for when I received it. I believe every year that they make that is electric fuel injection can be converted this way.
It does void the warranty. Frankly, there are OB out there running that are 30 years old. With proper maintenance and care, there is absolutely no reason this thing won't run like a champ for decades!!
@@wheelieking3976 can't take a 20 hp motor on lakes restricted to 10 hp or less. They won't know with my conversion as it looks like a 9.9. Also, I don't see it as a risk at all.
Great, basically doubled my top speed from 12mph to 24mph. My ob came with a Hight Thrust prop So, I had previously changed it to a 3 blade 10 pitch prop.
Nothing beats a good ole doubling of value. Love it. 😂🛥️That's plenty juice for a small fishing boat. You might not get to the bar as fast as the fellas with the Mercury 200, but you'll have a lot more beer money since you spent $25 on gas for the day and they spent $450.
You have a fun point, but $450!? LOL Maybe if there were 5 200's hanging off the back... My 250hp sterndrive on the back of a 22' fiberglass cuddy only uses about $80 for the full day of blasting around.
I don't know all of them that this can be done with, but I am reasonably confident in saying that all of the models that are 4 stroke with electronic fuel injection then they can be converted!
Ive got a 2006 yamaha 4 stroke f8cmh 197cc do you know what can be done to this to increase power? I know the newer f8 4stroke with the 212cc is the same as the 15hp counter part and think its just a carb and possibly ecm job on that one but i cant seem to find anything for the 197cc model other than 1 aftermarket carb kit to make it a 9.9
It would have been interesting to see how much of the improvement was just from the $18 restrictor plate mod and how much was due to the $440 ECM change-out. I suspect 80% of the improvement came from 4% of the modification cost, but I've been wrong before. Also be interesting to know the difference between the 9.9 and 20 HP list price, and whether there's a resale market to recoup some of the $440 by selling the old 9.9 ECM on EBay. (And can anyone flash the 9.9 HP ECM to make it a 20 HP ECM without actually replacing it?)
You raise some interesting questions. Hard to belive there would be much of a market for a 9.9 ECM, but possibly. I do know some guys that have just done the switch from restrictor plate to the screen. They say it made a measurable difference, but I don't know how much.
Couple videos on just making the hole in the air plate to increase speed... guy said if you make the hole to big the air/fuel is and issure for the 9hp ecm. So if you just add the new restrictor plate if will not run well. Cuts out at highter rpms
I know there have been some that did not change the prop, but if you run the stock 3 blade nine pitch the motor will run at max rpm right near the redline. I got a 3 blade 10 pitch for mine so I run wide open comfortably below the redline. Pushes my 14.5' aluminum deep v to about 24.5 mph!
if you are having trouble with fitting rubber parts back together, use a little dish soap as a lubricant. works well and then dries out or washes off later in use.
Seems like you should be able to get quite a bit more out of that with higher pitch. I have a Johnson 25 and I am running a 10.3X13 pitch. I can run about 30 mph by myself and 27mph fully loaded with two people. It's a 14 ft fully decked, a lot of gear, and 2 trolling motor batteries as well. I saw some of your other comments that it's common for people to run the even smaller 9 pitch but that seems like quite the difference from my 13. I guess I'm not sure what the diameter is either, or what rpm you are turning. Might just be a big difference from 2 to 4 stroke as well.
I do think the 2 strokes turn a higher rpm. I used a temporary ob before this Suzuki came in. It was a 9.9 2 stroke that had a carb mod to 15 hp. It got me to 18 mph. I'm really happy with this set up. I never have to worry about hitting the redline and get pretty good speed out of it. Plus I can use it on 10 HP restricted lakes with no issues.
Nothing more gratifying than doing something yourself to save money.
You got that right Tom!!
There is no need for a new ECU, I did this same conversion and by the advice of a Suzuki tech he said the stock ECU would adjust to the added airflow and it did, runs great.
Only parts you need are the flame arrestor on seal
Glad to know that is working for you!
@1224Peterson Still no problems? I’m thinking about doing this but the ECU is really expensive.
@@kitkat101 Running like a dream!
@@kitkat101 No issues, I've been checking the spark plugs and they look good, no signs of running too rich or too lean so the ECU is doing it's job. You will need a new prop tho, I got an 11 pitch, the stock prop on these are horrible anyways so budget for a prop as well
No ECU swap abd you won't get higher revs. 20hp revs much higher
with the new found torque, you can install a 12 or 13 pitch prop and get significantly more top speed out of that motor now.. Probably closer to 28-29 mph
Awesome! Thanks for the tip!
We used to put the 9.9 cover decals on 15 hp motors, forty-something years ago.
That’s another way to go! 👍
We used to do that with a 6hp Mercury cover on a 15hp Mercury, just to fool the police, my little Zodiac Cadet 310 used to go over 50kph with that 15hp Mercury, the whole boat and motor combination weighed like 90kg with a full 24 liter tank.
@@Dark30Outdoors
Try putting the original control module in and test the speed and acceleration just by removing the air restrictor.
? ? ? Will it run a little bit better or a little worse or alot worse?.
Manufactures used to put 9.9 carbs on the 15's to meet the 9.9 rule when it first came out. I have a Gamefisher like that.
@@BobWiersema Yep, and guys would do a carb conversion on them.
A prop change would increase speed.
The 20 horse has a different prop.
The ECM controls max rpm.
Yes, mine was changed.
To what? Did it help? Going to do this asap
Nice demonstration and glad you took it out on the water too. Didn't even know you could do that. Appreciate you sharing the knowledge.
Yeah, it was easier than I thought it would be. Thanks for watching!!
That's a serious restrictor plate, heck it can hardly breathe.
Haha! It certainly is!!
@@Dark30Outdoorsalum creek north of Columbus ??
@@jeffconley819 yes!
Right that's almost worse than a full choked carb..
Hi there, I have since been told the ecu does restrict the rev limit. The 9.9 revs to 5800 the 15 to 6000 and the 20 to 6200 that's how some of restriction works
That makes sense!
Get a 20hp ecu
Little soapy water as a lubricant helps sliding things with rubber gaskets or mounting surfaces in place a lot easier
Thanks! I appreciate that tip!
Windex is great for that, it dries nicely.
Really don't want to get water near a ECM or the connector. Silicone lube spray would be better.
@@SynicalBeats not really as silicone spray stays slippery, where as windex and/or soapy water dry. Thus the rubber still offers support via friction. In most cases like this I use Saliva (yes I spit on it 🙂)
I upgraded my 15 to 20, if I knew what I know now, I would have just bought the 9.9 and upgraded it. Others have mentioned changing the prop, but when I looked it up, the standard prop was the same for both. Haven’t had it out on the water yet, but it runs fine on the Mickey Mouse hose fitting
Awesome!! Every little bit helps! 👍
That’s awesome! Never knew you could do that. Looks pretty easy.
Yeah, it wasn't hard at all!
If I was doing this I would check the ignition advance between the two models and the injector size. If there the same spec I would say its the washer between the airbox and the throttle body, that is restricting down to the smaller hp
Gotcha going on all four of my channels! You should be getting your watch hours very soon! -The Reef Robber
Awesome! Thanks buddy! Each day I check it, and they have a funny way of doing math, but I just keep going!! lol
@@Dark30Outdoors I know what you mean! You’ll get there
Man! Your video was awesome thank you. I’m soon to get the Suzuki 9.9 2022 4 stroke short shaft. Thank you for sharing that. If I ever have the need to up it to 15hp or 20. I now know how to do it. So amazing again thank you. Your video was super informative. Great job.
Thank you! I appreciate the kind words!!
Hi Robert, I just got my 2022 9.9B today, cannot find anyone selling the 2022 ECU and parts. Did you just go to the dealer? Is yours a 00995F-24xxxx?
@@tonymclean1707 i went ahead and got the suzuki 6hp
Nice of you to share and make the video, thanks!
Showing some love from Canada 🇨🇦 ❤
Thanks!!
You need to swap the prop to a higher pitch to absorb the additional power. That will give you a higher top speed.
Yes, it was previously changed! 👍
Looking to do this to a Mercury 9.9 EFI. The parts seems to be the same between the 9.9/15/20 EFIs, except for the ECUs and restrictors on the 9.9/15. Hope it'll be this easy for me.
I think it should be. 👍
@@Dark30Outdoors Yep, it was very similar, and worked. The ECU was a little harder as I had to remove the lower cowling a bit since the electric starter take up some room above the ECU so I couldn't pull it out without some more space.
@@john6268 That's awesome!
The Reef Robber is on here running all your videos for you. Hope you get your hours soon!
Larger prop will increase top speed and still give good hole shot. Try stainless cupped prop, big difference.
I might some day, but for now I really like what I got.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
Good information, but that sounds quite technical.
@@Dark30Outdoors Here is a description of how to flash and the firmware file from a 20 motor with manual starter. drive.google.com/drive/folders/1hAlZkspz57omBZYWyYuO9dZ9kTFsA9RR
@@Dark30Outdoors Bro, I can also give you a suzuki sds diagnostic program to diagnose the motor. All you need is a Chinese k-line adapter for 8-10$ and PC win xp-10.
Where did you get your parts.
Boats.net
Thanks
Nice upgrade. Great demo video, Kyle.
Thanks! It was fairly easy to do!
Flame arrester on the intake of carb/fuel inj. system. I'd call it restricter plate.
Yeah, that's just what they call it.
All marine gasoline engines should have a flame arrestor on the intake. Especially an inboard or I/O. You have never seen a backfire (and it's not a noise from the exhaust)?
The airbox is the actual flame arrestor on outboards.
@@glennjames7107 Those engineers, what they won't think of.
Thats great I was under the impression you had gotten a new motor!
No, the upgrade wasn't a purchase but rather a simple conversion!
Really!! That’s All you do to convert 9.8 hp to 20 hp!! Amazing.
It's pretty sweet!!
The reason this works for Suzuki is because the 9.9 and the 20 are the same motor with different intake controls. They both weigh 108 pounds in the long shaft version. But other manufacturers have different approaches. Example Tohatsu offers a 9.9 that weighs the same as their 20. They also offer a 9.8 that is significantly lighter. The 9.8 weighs 80 pounds. If you are frequently using a portable on a dinghy from a larger vessel, the difference in lifting 80 pounds or 108 pounds is significant. It magnifies when mounting to a dinghy in a rolling anchorage. I only post this to highlight the differences between the 2 brands. I have a Tohatsu 4hp on a small boat and a Yammy 175 on a slightly bigger boat. I don't own a Suzy.
Very true!! 👍
@@Dark30Outdoors Thanks for the thumbs up. My comment was nothing against your post. The upgrade is awesome and probably less expensive than the 20. I was just thinking of different applications which have different priorities. As a young man in his 70's, weight is becoming very important.
@@williamstreet4304 I can certainly appreciate that!
This is true - most, if not all 9.9s are restricted versions of the 15 or 20hp. The manufacturers do this across their lineups - I think your yammy is the same engine as the 200, just without vvt
PS: 70 ain’t nothing young lad!
The Tohatsu 9.8 is smaller cc than the 9.9.
The 9.9hp Tohatsu is same engine with the 15hp and 20hp versions, they also have different restrictors and ECU's, so from the 9.9hp you can get 20hp out as well.
I remember yrs ago ( carburetor days) you could buy a merc 115 and re jet it to a 150 by using the 150 jets, under $25.
Now, that's a heck of a value!!
I guess you refer to the straight 6 Tower of Power. What a beautiful engine was that! Good memories from a long time ago.
Question. Does the Suzuki 9.9 hp 'cowling' fit on a 20 HP (vise/versa) It be interesting to know. Never mind.. I found out it does.
Great mod 👍🏼…simple unlike the old 2 stroke carb and tuned exhaust exchange…need my 9.9 Yamaha 4stroke done too but probly won’t be same mods…
Quite simple really. Not sure if it’s the same for Yamaha, but it would be worth looking into! 👍
Interesting to see if it uses less fuel at the same speed without that restrictor. In a similar thing where the manufacture limited the power output for the same engine, I had a Cub Cadet with a Kawasaki engine that went from 22hp to 25hp by just allowing the throttle butterfly to open fully.
If I had to guess it likely uses a bit more fuel, but it isn't so much that it is really noticeable at all.
GM used to limit the throttle valve opening angle on some cars when they had corporate edicts on the amount of power for that size car. One of the first buff-book recommendations was to have someone fully depress the accelerator pedal while you stared down through the top of the carb - of course with the engine off and air cleaner lid removed. If you saw the throttle plate wasn't going vertical, you could look for what was stopping it short and remove that restriction.
Unbelievable you can convert to that much more horsepower with such few parts. Good job
Yeah, pretty slick huh!!
9.9hp engines are tailor made for specific markets and regulatory rules. like in the EU the maximum engines kids under 16 can use is a 9.9hp engine. Easier to downgrade an existing engine design to meet the hp requirement than making a whole new engine.
@@gromitNOR83def not the whole EU, for example in Finland, a 15 year old can drive boats under 5.5 meters with 20hp motors.
Check to see what sparkplugs go on the 20 HP. Might be best to run with them.
I believe they are the exact same. 👍
The restrictor allows running only at very low speeds…. Pumping losses go way up once you go much above Idle speed.
Exact same thing on the 40/50/60 Zukes!
Good to know!! 👍
I just bought a 2024 Suzuki DF50 to replace my old 1999 DF40. Nice to know I can raise it to 60 later on if I have to. Thanks for the hot tip
I have a 2021 Suzuki 9.9 and I am waiting for my warranty to expire, then I am doing this to mine. Parts are already on the shelf in the garage.
Sounds good!!
You don't have to wait, why should you have to wait? If you have a new control box with the firmware from the 20th motor, you can safely change it right now, no one will know about it. If the motor breaks, just put everything back in, you can wear gloves so you don't leave fingerprints.
That was pretty cool Kyle, Thanks for sharing
You bet! Thanks for watching!!
Why not Suzuki make different Map configuration in the ECU to change power delivery?
My question to you and anyone in the group who completed the upgrade to either 15 or 20hp is whether a noticable increase in power was noted at low to mid RPMs, or only at the high end because the WOT max was increased? For example would I expect to have greater speed (and therefore greater fuel consumption) at say 3500RPM (my expected typical cruising speed) after converting to 15 or 20hp? Thanks!
My boat sure gets up on plane a lot quicker than it did before! I don't think the increased fuel consumption is that noticeable really.
@@Dark30Outdoors
This is so cool Kyle! Nice you went from 13mph to 21mph and your take off n getting on plane quicker. Very nice!
Yeah, since the video I have actually adjusted the tilt and my new max speed is right at 24 mph! For my little boat that's great!!
@@Dark30Outdoors that’s awesome 👍
I just came across your video. It’s straight forward no bs and informative. Keep up the good work
Thank you! I appreciate that! 👍
Sweet!! Do you know if I can get more hp out of my 20hp tohatsu efi 4 stroke?? Please 🙏
Not sure. For this project, the 2 different motors are the same except the lower hp one reduces fuel flow with a restrictor plate and then uses a different EFI module. Something you could look into.
Typically all 20hp engine families are the same factory tuned up 15hp, or 9.9 (if EFI). But more than 20hp are a completely different larger engine family so no, its not possible.
In the smaller 4-stroke outboards, typically the same engine families are grouped as follows;
4, 5, 6hp
8, 9.9
9.9, 15, 20 (Merc & Suzuki only)
15, 20
40, 50, 60, 70
75, 90, 115
Great mod and I am sure you saved thousands.
Thanks, but I only saved around $40 or so. Though, technically I have an OB motor I can run as 9.9 or 20 hp. Also it says 9.9 so it’s valid on lakes that are 10 hp or less.
I would love to know how much difference it would be to just replace the restrictor plug with the flame arrestor with the original cd in place.
Good question, but I don’t know if that would have a negative impact on the existing ecm.
I didn't even realize you could to that! And looked like a simple job. Nice man!
Thanks Joe!!
You mentioned that your 9.9 is 2021. So is mine, so because I see at least a few ECUs with different part numbers can you tell me which one you installed? For example 33930-89L20, or 33930-89L30, or 33930-89L40 ? The part#s for the flame arrestor and seal are straightforward. Thanks!
The part number that I ordered is: 33930-89L20
@@Dark30Outdoors My model has elect start, remote/non tiller, power tilt and is, I think, different than yours so I'm unsure whether a different ECU is required or not for those features. It's an expensive decision to get wrong if it cannot be returned. Maybe I need to locate a 2021 DF20 with same features as mine and figure out what ECU is installed. Or maybe I'll just do the 15hp upgrade using a bored out restrictor plate and leave it at that. Decisions decisions!!
@@donc2334 Okay, yeah mine is a tiller model. Not sure if it's different for one that is cable steer.
Hi 👋 I love your fish behind you . Thanks for sharing. It’s amazing what you can learn .
Thanks for stopping by!!
you can take the side cowling off to pull the air box down and forwards, I was staring at one of the bolts the whole video
Thanks! That's a good tip!
Where did you get the parts to make the conversion? Thanks
I ordered mine from Boats.net.
One could get most of the performance for free by just removing the restrictor. From what I've read the only difference between the ECUs is that the 20HP one allows an extra 500RPM before the rev limiter stops it so you'll get all of the acceleration of a 20 and just not have the same top speed potential. Putting the right prop on it will probably be worth more than the ECU swap without a re-prop.
Good to know.
It would be nice to see what the flame arrestor looks like.
Good feedback, sorry if I missed showing that item.
He showed it, it covers the throttle body
You need to re-prop, it will make a big difference in the fuel efficiency, and a good difference in increased top end.
Previously done.
That’s awesome that you can upgrade by 10 HP that easily and for less than $500. Sweet ! Wonder if I can upgrade my Johnson 15 hp to a 30 as easily. Something to look into. 13 mph up to 21, yeah that’s a great upgrade and getting on plane that much quicker. Good job Kyle !
If your Johnson is a 4 stroke that is fuel injected then it might be possible. The only other model that I have heard of people doing it on is the Yamaha.
@@Dark30Outdoors yep she’s a fuel injected 4 stroke but she’s also a bit older 2013. She gives me pretty much all I need.
@@bucktalesoutdoors7566 Johnson never made a 15hp fuel injection 4 stroke.
@@igotmesothelioma you’re right my 15 HP 4 stroke Johnson is carbureted. Oh well ! It goes ok.
@@bucktalesoutdoors7566might be able to change the carb to a larger hp one, change fuel pump, and some other things
Is there a specific range of 'yrs' these 4 stokes accept the parts he made reference to? I love the idea, something way to 'stick it to the man' price gouging boat registration fees for 10 and over.
It should definitely work for any Suzuki 4 stroke outboard 9.9 that uses this electronic fuel injection system. I'm not certain of all the years that use this same system, but I'm sure that information is out there somewhere!
@@Dark30Outdoors Ok now I have a plan. What ever yr the motor is, I will compare the 'part numbers' for the specific parts, before I purchase the motor. The main objective of the mission = more horsepower for almost free. Yay (and fooling the man)
@@renegademind1833 the value of the parts swap is very close to the value of the 20 hp motor. I have lakes restricted to 10hp or less and my motor shows itself as a 9.9! :D
So latest 9.9 efi tohatsu outboard is at 84.9lb so by changing parts to 20hp it still remains at 84.9 lb ...which is nice because at stock 20hp tohatsu, weight of engine is at 104lb...so ur saving 15lb of weight. Question is, 15lb of weight, is it worth all the hassle? Or is it just better to buy 20hp outboard?......
I’m not familiar with the Tohatsu brand. On the Suzuki, they build their 9.9 and 20 exactly the same so both weigh the exact same.
The same weight with Tohatsu 9.9 15 20hp are 104p for manual start
@@HomeAndTravelUSA thnx
I'm from the Coboconk area. Where did you get the parts? Thanking you in advance
I bought mine from Boats.net
@@Dark30Outdoors Just ordered it. Thank you! Now I'm going to sell my 15hp ECM
without a new prop, your mostly gaining acceleration and torque. you could probably gain some decent top speed with a new prop
Yes, it had previously been changed to a 10 pitch.
Pretty cool conversion! Good video man!
Thanks Matt!!
Would this be the same ECU for a 9.9 that has controlls instead of a tiller motor? I was not able to find any info only manual and electric start. No mention of motors with controlls. Thanks!
I'm not sure. I would think they would be the same, but I don't know for sure. If you called an official parts dealer I'm sure they could tell if you if the part numbers are the same or different!
@@Dark30Outdoors thank you, I will look into that.
As an expert on these motors, I state that the control boxes for electric starters and manual starters are completely different hardware and software. You don't need to buy anything, you can flash your control box with the firmware from the 20 engine, the firmware is available online.
Can you do this to a Mercury 9.9 ? Mine is a 2022 non EFI and I would like to convert to a 20
Possibly, but I don't have any experience with Mercury outboards.
We will be there Wed but we're not having you do a video of us this week so others can get in, hope we have a large turn out.
Sounds great!!
I could only find the links to camera gear and such and nothing for the Suzuki
Those links are Amazon links and the parts aren't on Amazon. The part numbers are listed in the description. You'd have to order through a Suzuki parts dealer.
@@Dark30Outdoors Sorry. I confuse easily.
you got twice the hp and mph out of that...thats incredible..can ya do it with a 150 yamaha...
Not sure, but I feel like it's probably a stretch! lol
Do you think you could do the same to a Mercury 9.9?
I'm not sure, but you could look into it.
Awesome upgrade! I thought you might be boring the cylinders 30 over and putting a turbo on it. 😂
Hahaha! Now, I'm brainstorming turbo ideas! lol
What build year is your 9.9 now a 20hp suzuki.
Mine is a 2021.
Mine is a 2021.
@@Dark30Outdoors thanks for the reply. you know if it works on older models or from what year this mod is possible?
@@QuickJoe I believe it can be done on all 4 stroke modes that have electric fuel injection.
Can you provide your model number on here please? @@Dark30Outdoors
Wow, I wish I would’ve saw this two weeks ago. Just sold my nine horse and bought a 20 horse. Great video.
Thanks! 👍
is that a Mitsubishi logo on that ECM?
I think it is.
Hi , what it was the price for all parts ? Thanks for the video
Listed in the video description, at the time I paid approx $458 for the 3 parts!
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
Hi, what year is your outboard? What years of outboards can you do this?
Mine is 2021. I believe it can be done every year that is 4 stroke with electric fuel injection.
Wonder if you had a Suzuki 6 hp with a carb...Is there any hop ups for that? cost? performance?
I'm not sure. I know the 9.9 and the 20 HP that Suzuki makes use the exact same housing, and really everything is the same except for those 3 simple parts!
Have you had any issues with the engine after doing this as it’s a couple years later
No, none at all. In fact, I will be doing a 3 year review for the motor very soon!
Does anyone know if you can upgrade the 2023 9.9 to 20hp? Is everything the same or have they changed anything?
I don't see why not unless they changed the housing or added something and I doubt that to be the case.
I have a Mercury 9.9HP can I do the same?
I'm not sure as I don't have experience with Mercury outboards, but it's worth looking into for sure!
That was very cool brother! I can't believe it was that simple! In your opinion is it better to do that or bye a 20 hp from the start and what would be the price difference? Thanks for sharing my friend!
I think it was maybe $100 cheaper converting it, but technically I can run my OB motor with 2 different configurations! Plus, here in Ohio we have lakes that are 10 HP or less. Well my motor is shown as a 9.9!
@@Dark30Outdoors Great idea buddy!!
Other than getting around the boating laws. The price on a 9.9 hp is around 2400. A 20 hp is 28-2900.
Yeah, wasn’t a big money saver, but that wasn’t the point.
That's very cool that you can change it to a 20 HP with just changing out those 3 parts.
In fact, you can not buy anything at all, take out the metal flap from the rubber band, and the control unit ebu flash the firmware from 20hp motor, firmware is available on the network, I can share. It can be flashed with any programmer, for example piasini v4.3.
@@gordonshumway4763 Do you know where one could obtain firmware for 20 hp, electric start external controlbox?
@@capsterism Hello, buddy!
Write your e-mail.
@@capsterism Hello, buddy!
Write your mail.
@@gordonshumway4763 seems my posts keep getting removed... 😞
The Reef Robber here on another channel getting you watch hours!
You rock!
I want to ask about the 2 stroke Suzuki ??? what items are you buying ??? can you tell me ???
I don't have any experience with the 2 stroke Suzuki outboards.
I want to get mine done like you how much and where you get the parts?
Boats.net. I can’t recall price, ballpark 2 years ago around $445 for everything.
Hi, Have you had any problems with the conversion? Thanks
None at all! The motor runs like a champ!
What a great video!! Very well done, step by step!!!
Thanks Scott!!
Did you buy the parts direct from the Suzuki dealership in the US or did you get them from your local boat shop? I was looking into doing the mod if I ever came across a second hand Suzuki 9.9 HP outboard but I wouldn't know where to look for the parts.
I ordered them from Boats.net
Just found this, but what year/model number is your motor and what other years are the same, or how to find out? Thanks.
Mine is a 2021. I’ll see if I can find the model number. Might be in my unboxing video for when I received it. I believe every year that they make that is electric fuel injection can be converted this way.
@@Dark30Outdoors Thanks. Model number should be on a plate or something along with serial number, yes?
That’s great what happens with the 5 year warranty when you’ve done this conversion ???
It does void the warranty. Frankly, there are OB out there running that are 30 years old. With proper maintenance and care, there is absolutely no reason this thing won't run like a champ for decades!!
Big risk to save 300 odd bucks in my opinion. Just buy the proper 20 Hp.
@@wheelieking3976 can't take a 20 hp motor on lakes restricted to 10 hp or less. They won't know with my conversion as it looks like a 9.9. Also, I don't see it as a risk at all.
@@Dark30Outdoors buy a 10 Hp decal and put it over the 20 Hp one.
@@wheelieking3976 what about if they inspect the VIN tag attached to the engine. That shows the manufactured HP etc
curios, how was the change?
Did you use the same prop?
Great, basically doubled my top speed from 12mph to 24mph. My ob came with a Hight Thrust prop So, I had previously changed it to a 3 blade 10 pitch prop.
Nothing beats a good ole doubling of value. Love it. 😂🛥️That's plenty juice for a small fishing boat. You might not get to the bar as fast as the fellas with the Mercury 200, but you'll have a lot more beer money since you spent $25 on gas for the day and they spent $450.
Absolutely! You got that right!!
You have a fun point, but $450!? LOL Maybe if there were 5 200's hanging off the back... My 250hp sterndrive on the back of a 22' fiberglass cuddy only uses about $80 for the full day of blasting around.
Which models and which year builds?
I don't know all of them that this can be done with, but I am reasonably confident in saying that all of the models that are 4 stroke with electronic fuel injection then they can be converted!
Works great but now your hrs are wrong and you have no more warranty ?
I'm not concerned in the least!
If the motor breaks, just put everything back in, you can wear gloves to avoid leaving fingerprints. The engine hours are stored in the ebu memory.
Ive got a 2006 yamaha 4 stroke f8cmh 197cc do you know what can be done to this to increase power? I know the newer f8 4stroke with the 212cc is the same as the 15hp counter part and think its just a carb and possibly ecm job on that one but i cant seem to find anything for the 197cc model other than 1 aftermarket carb kit to make it a 9.9
The 15hp counter part to mine is supposed to be 323cc so its a fair bigger engine aswell
I really don't know much about the Yamaha motors.
It would have been interesting to see how much of the improvement was just from the $18 restrictor plate mod and how much was due to the $440 ECM change-out. I suspect 80% of the improvement came from 4% of the modification cost, but I've been wrong before.
Also be interesting to know the difference between the 9.9 and 20 HP list price, and whether there's a resale market to recoup some of the $440 by selling the old 9.9 ECM on EBay. (And can anyone flash the 9.9 HP ECM to make it a 20 HP ECM without actually replacing it?)
You raise some interesting questions. Hard to belive there would be much of a market for a 9.9 ECM, but possibly. I do know some guys that have just done the switch from restrictor plate to the screen. They say it made a measurable difference, but I don't know how much.
@@Dark30Outdoors swap back the 9.9 ecm and report back.
Recon it is just a $2 part in the ECM to increase the fuel flow to match the increase air intake.
@@borisj4054 That's very interesting!
Couple videos on just making the hole in the air plate to increase speed... guy said if you make the hole to big the air/fuel is and issure for the 9hp ecm. So if you just add the new restrictor plate if will not run well. Cuts out at highter rpms
Do you have to change the prop to optimize?
I know there have been some that did not change the prop, but if you run the stock 3 blade nine pitch the motor will run at max rpm right near the redline. I got a 3 blade 10 pitch for mine so I run wide open comfortably below the redline. Pushes my 14.5' aluminum deep v to about 24.5 mph!
Thank you so much, I'm going for it soon
@@PJ_2761 Awesome!!
I wonder if i can upgrade my carburetor on 20hp mercury to get more hp
Not sure, but it’s worth looking into. 👍
@@Dark30Outdoors we have lakes limited to 20 hp and it is just short of getting boat up on plane to get decent speed with a few people in boat
I dont mean to be picky but shouldn't you increase prop size as well?
The prop had previously been changed to a 10.
if you are having trouble with fitting rubber parts back together, use a little dish soap as a lubricant. works well and then dries out or washes off later in use.
Great tip! Thank you!
do you get any performace gains with just the flame arrestor? or do you need the ecu?
I am not sure, I think you do get some. Though, the fuel injectors under the 9.9 ECU are going to push through less fuel than the 20 ECU.
I think the ecu raises the rpm limiter…
Most fuel injectors vary flow by pulse width modulation so injectors may not need to be changed.@Dark30Outdoors
Hey will this work on the new gray susuki outboard 9.9 motor?
@@ASMRLIVEFEED it should! 👍
Seems like you should be able to get quite a bit more out of that with higher pitch. I have a Johnson 25 and I am running a 10.3X13 pitch. I can run about 30 mph by myself and 27mph fully loaded with two people. It's a 14 ft fully decked, a lot of gear, and 2 trolling motor batteries as well. I saw some of your other comments that it's common for people to run the even smaller 9 pitch but that seems like quite the difference from my 13. I guess I'm not sure what the diameter is either, or what rpm you are turning. Might just be a big difference from 2 to 4 stroke as well.
I do think the 2 strokes turn a higher rpm. I used a temporary ob before this Suzuki came in. It was a 9.9 2 stroke that had a carb mod to 15 hp. It got me to 18 mph. I'm really happy with this set up. I never have to worry about hitting the redline and get pretty good speed out of it. Plus I can use it on 10 HP restricted lakes with no issues.
Hi - Tom from New Zealand here. I loved your conversion. What year is your Suzuki outboard?
Thank you! Mine is a 2021!
Can you do it on a 2023?
I would think so, but I am unsure if they made model changes in that year model. It would certainly be worth looking into!
If bought new what would be the difference in retail price between a 10 and a 20 ?
Not sure. That wasn’t much of a factor for me.
Can you do it on tohatsu? And with new hp is it heavier?
Possibly, but I’ve never looked into it with that brand.