Johnson outboard 9.9 with a big secret part 1
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- Опубликовано: 17 апр 2020
- I purchased a Johnson 9.9 and discover something unique about this outboard, watch and find out what it is. Plus it is getting some awesome upgrades
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Video equipment used
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email me at
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mail me at
RMD Creations
PO Box 387
Wellman, IA 52356
Merchandise link below
/ @michaelsbackyardmarina 
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A 9.9 to a 15hp. One of Johnson's little secrets to keeping their product line up. My Dad worked at the Waukegan plant for 33 years. He told me this secret years ago.
I purchased a 15 HP Johnson in 1982 in Manaus Brazil to use in upper reaches of Amazon tributaries. It was a factory modified motor based on the 10 (9.9)HP motor with the stouter lower unit from the 25hp model. It had a heavy duty low pitch propeller. The advantage was that it was light weight enough to haul it up some of those 50 ft high river banks. We mounted it in a 21ft aluminum boat and travelled 10 days for our first trip to an Indian village. We put on several thousand miles of travel with that boat and motor before it was stolen. But it was a good reliable motor - not fast, but it pushed a load of 1100 kilos easily. We often had to jump over logs, and under logs to get upstream. Thanks for bringing back a fond memory!
Thank you very much for your video. I just purchased two 9.9 Johnsons (a 1975 and a 1976), and with the help of your videos I'll have no problems tearing them down and making them as new as possible! Thanks again, stay safe. Watching part 2 right away!
glad the videos helped. Thanks for watching and commenting
Thanks for these videos. I bought a little skiff a few years ago that has a 15hp Evinrude, of the same vintage as yours. I believe they are the same engine, just blue instead of white. Your videos will help me in getting it running again. Thanks again.
We need more boat mechanics that care about their work like you do. Thx for that! 💯👍🏼
I appreciate the kind words, thank you for watching
Just now seeing this video. My man is giving really good info. Helped me a lot to figure out an old motor. I like knowing what I am working on before working on it and seeing others break it down helps. Thanks for the video!
Glad to help
I like watching you better than anyone else working on low ride Johnson 15hp . Thank you so much
Much appreciated Joe, thanks for watching
Stephen C Foster park near me has a 10 horse limit on boat motors so everybody used to buy 15 horse and order a 9.9 cover to conceal their deception. The Rangers wouldn't look too hard back then if you weren't causing trouble. The first 2 digits of the vin plate is usually either 9.8, 9.9, 10 or 15, and you can change the 15 to 9.8 if you're careful and smudge the whole plate a little. Just a little outlaw fun from back in the day.
I should've read more comments lol
Mines the opposite its a 9.9 with a 15 horse cover.
@@ExploringCabinsandMines Well sir That is call getting ripped off lol
@@nickalasd.1091 Well sir I got it for free soooo .....not.
That water tube grommet that you said doesn't look right is just a different style that was used on those outboards especially, to make it easier to get the copper tube guided into the grommet...it is a wide mouth grommet and will work on most any Johnson Evinrude. I use them when I can...they help prevent the grommet from folding over and obstructing flow as it is nearly impossible to see if you have the tube IN the grommet when sliding the unit up into place on some motors. Great, no nonsense, helpful video for folks doing this for the first time.
Always agree, when you purchase something used, check and change oil, plugs.fluids, filters, etc so you have a starting point of your own for future maintenance.
Absolutely. Thanks for watching and commenting
Mike
I was a master tech on OMC AND Johnson/ Evinrude outboards back in the 70s thru the late 90s. You are correct on the conversion from 9.9 to 15 hp. I you check the parts manual for your model year you will find that there is a shim that is fitted under the reed plate that will allow the reeds to open a bit further which in turn allows for the extra fuel. Also the difference in carburetors is the size of the venturi.
Absolutely correct. So many folks want to argue about it, it crazy. Thanks for helping me set the record straight with some folks.
Hi Michael.......greetings from Australia. Just inherited a 9.9 Johnson and knew nothing about it until now. Many thanks for sharing your knowledge and indeed your friendly presentation. I am confident I will now be able to repair and use it as an Auxiliary motor for my boat.
Great to hear!
Great info-Im working on my 9.9 1980 original owner was Dad. Been sitting for 8 years--
Just so you know, I didn’t think you were “long winded”. You made sure we in the audience understood where you were and where you’re headed. I have a 1990 Johnson 8hp. I o all my own work as well. Thanks. Headed to Part II .
Cool, thank you for watching.
Thanks for making this. Now feel like I could open one of these up and work on it myself.
I think if you look around Canada you will find thousands of that year or model in Evinrude and Johnson outboards. They seem to be a bullet proof little motor!
I enjoyed your presentation! Hello from Canada! Please stay safe!
Your right I,ve owned two the only reason I bought a second one is because someone stole my first one ( I am from ontariariario)
Our family have bought 10 9.9’s from 1974 and they all still run today
Oh! I'm so glad the algorithm suggested this. I'm about to buy my buddy's old 1960s 14' fiberglass boat with a Johnson 9.9 on the back.
Do it for sure. Thanks for watching
I just bought my first boat, a 14 foot that came with a free 1994 9.9 Evinrude 2stroke. Guy said it had very very low hours but didn’t run. I had to fix a couple wires that were chewed from mice. The air box was packed with acorns, and the carburetor was thoroughly cooped up. I took it all apart, cleaned the carburetor,got the Jets passing air, put it all back together and it fired up on the first pull, purrs like a kitten.
My one concern, it seems to not squirt the fresh water at idle but does very well when throttled up slightly🤨 I hope it’s not a problem. I’ve only ran the motor 2 times for a few minutes so far, haven’t taken it out yet.
Your video would’ve help me a lot if I saw it before I did all the work 😂
Wow. Happened upon this on accident. LOVED the video and watched the whole thing. I’m not mechanical . . . Yet. Thanks. Great video.
Thank you Mike really enjoyed it and learned a lot
I own a 9.9 Evinrude. I've never had to take the starter off to get the carb off. True, it's easier with the starter off, but it's not necessary.
Very informative..I really like the info on the difference between a 9.9 and 15.. thinking I'm gonna build me a sleeper for the water
Go for it!
I'm learning a lot from you ,thanks for all videos
Hi. As long as I can remember the 9.9 Hp and the 15 Hp were the same engines with the 15 just boosted (sorry I was early).
In my book at first look this 88 is still a beauty .Being that old the main problem will be the rubber parts craking.
These were the last years of the best quality engines and Envinrude-Jonhson ruled the water for their no nonesense Chevy style.
Good luck
Same Block...parts are interchangeable...I put these on more sailboats than I can remember...lol....I took a 9.9 all over the South Pacific...Half a pull and my motors start and go..Damn good motor and easy to maintain...Dont let anybody tell you different.
Knowledge Drop: 9.9 & 15hp OMC engine cowls are interchangeable as well
Thanks for your video.
My 13yo son just bought a 1977 Johnson 15HP. It has low compression in both cylinders (65 PSI) and no spark. We are pulling it apart and trying to get it going.
Tested with a voltmeter and found good charge to power pack and nothing beyond. So ordering a new powerpack.
Next we took the head off - the head gasket looked OK but we found the thermostat was rusted. Piston rings look OK too. So not sure why compressions is so low in both cylinders.
Anyway - really enjoyed your video thanks.
my dad did this when we had a buncha old motors laying around one day his buddy said, hey we got a tournament to go fish, an you might need more then that 6 horse, so we took a 9.9 we had just the same lookin one you used here, we went to one of his buddys houses an he got a 15 horse powerhead brought it home cleaned everything up real nice, welp he dropped it right on an bolted it down an it worked lol, he goes theres no way this hood ull close, but it did, at that point we looked at eachother an smiled lol we went fishin the day of the tournament an got way out in front of everyone an stayed there the whole day lol, gotta love old OMC motors an how interchangable they are lol
Yes you do, great story, thanks for sharing,
@@Michaelsbackyardmarina wild, one year later an i was recommended your channel i saw this in your uploads an found i had commented a year ago. went full circle lol
I have a 1986 Johnson 6 hp with the original spark plugs. I have used it every year all summer.
I've got a 25 short shaft you taught me things i didn't know thanks😊
Walter here, on my wives page. I just found your page and will now be a regular viewer. I like and appreciate what you are doing. This kind of help is something I believe we can all gain from. Thank you for it. I recently picked up an identical 9.9 and thankfully it runs like a top! I'll soon be playing with an 85 horse and will be using info I gain here to help me.
Welcome aboard!
37:03 solid gem 💎 👌 thanks for making an informative and inspirational video!
Glad you enjoyed it!
Like the explanation very complete even someone like me most experience is with a paddle can understand what you are doing
Nice job that cleaned up nicely 👍
Very interesting video. I will enjoy all of your future presentations.
Glad to hear that!
As a Master mech for Jonson I will say that you do a very good job and your Information is also very good.
Thank you.
Why do I watch this? 😆 Nice channel. Now I have another subscription to go along with the guy who digs junkyards for cars to fix and the bus grease guys😃. It is all so interesting.
I have a 15 foot aluminum boat and the only time I ever had to paddle was when I ran out of gas, (I will never, leave without a full tank again).
Even though my fishing buddy was on the other oar in my opinion that ordeal was tougher and more disagreeable than demolishing a boulder with a plastic picnic knife.
I learned a few things watching this video. Thank you.
Glad to hear it! Thank you for watching
I have always wanted a 9.9 Johnson!!
We had an Evinrude dealership in the 80's. (Roshway Sales and Service, Dryden Ontario). Same parts book and service manuals for the 9.9 & 15. I don't remember the parts book listing different carbs, but I do remember it listing different cylinder heads. (And I suddenly remember I'm gawd awful old)
Back in the 80's I bought a used 15hp Evinrude and replaced the decals with 9.9 decals so I could run it on our local "below 10hp" lakes. The serial plate on the mounting bracket still said 15hp but i was never checked by the game warden......I just never opened it all the way....LOLGreat little motors.
I agree you got to play smart.
Good one!
An excellent video. I have to disagree with your opinion about paddles, but that’s just me. I am definitely subscribing and I cannot wait for part two of this motor job.
Thank you very much!
David, South Carolina
In the early 80s my second outboard motor was a 9.9 Johnson in green and white. My cousin an outboard mechanic told me about this trick.
It ended up on my buddy's home built hydroplane.
The Florida pool pump motor bearing repair guy When Service Calls Longwood approved ! that was good info RMD
Right on
I have a 1981 35 horse still mounted on the boat it was sold on new and it goes like a rocket!~
When grewing up one of my neighbors at the cottage had a 9.9 hp, but in fact was a 15 hp with 9.9 badging. They are exactly the same size. He won the 10 hp and under catagory at our local Regata for years and has a shelf full of trophies to boot.
I have owned a 1982 15 hp Johnson for 20 years...the 9.9 and 15 hp motors were exactly the same. All parts were I
nterchangeable.The only difference between the two motors was the jetting in the carbs and the timing.The 15 ran at a little higher rpm
Cheating must have made him so proud of himself
@@fishhuntadventure for real! What a jerk
Getting dad's old 9.9 Johnson and '57 Johnson 7 1/2 he bought new like the 10hp. Mine is a 1980 maybe. I subscribed and probably will contact you when they arrive. Had them shipped from Maryland to CA. Arrives tomorrow or Tuesday hopefully. May do your upgrade to make it a 15hp. Many thanks for your video. Steve
send me an email of them running when you get them done
Enjoyed the video and found it very helpful.
Glad to hear it!
Thanks u showed me how to take apart my bottom end off my 61 18hp Johnson that runs great I think I have a seal lacking in the gear box I've had water in it when I changed the oil and there a oil spot when I put it in the water and it doesn't like to run in low rpms in gears
Our '62 OMC Gale 15 HP is the same motor. Split the lower unit after draining. The O ring seals in your prop shaft are probably long deteriorated to nothing, replace them. OMC did not use RTV Blue when they made these in the 60's but if the motor lower unit has hit any rocks and stumps at speed, in it's life, the rubber gear case seal could be leaking also. Put RTV Blue under the seal as well a small bead on top of it to insure it's water and oil tight. Back then OMC used fiber gaskets on the gear case filler/drain screws; mid 70's changed to thicker rubber ones. Any oil resistant gasket material or rubber washer will work; add RTV Blue to insure seal and to keep the screws from coming loose from vibration. Let the RTV Blue dry 2-3 hours before refilling with gear oil, unless temps are over 80° F, 1 hour is long enough. Low speed carb adjustment needs to come out 1/4- 1/2 turn or the jet is clogged or just worn out after so many years. Try opening 1/8 turn at a time. If that doesn't help check/add/change the fuel line filter and the low speed jet.
As for the rubber pull handle, depending on the model year, some used a 3/16" - 1/4" flat washer just under the knot others used a small galvanized steel plate with a hole (about .3" x 1") under the knot to prevent the starter rope from pulling thru depending on the rope size/ motor HP.
i use a stainless washer on every pull start I own.
Hid the 15hp on a 9.9 only lake! Great find!! Probably on a posture boat...
I have a 9.9 Johnson 1984. I purchased this motor brand new and as such have had it it's entire life. Believe me go back to the Champion plugs. Mine still runs as good as new.
I thought you should know - although the Comet cleanser has no abrasive, the Magic Eraser sponges DO have embedded abrasives. That's why they work so well - but they can leave fine scratches, so go easy with them.
That screw on the roller is for syncing the mag timing to the take up of the throttle,there should be a line on the mag ramp that should just move the carb linkage as they cross paths. thanks
A top end performance tip: scratch marks where the ramp is currently assembled, loosen ramp screw(s) and tap the ramp a tiny bit (1/64" at a time) and advance the ramp into the roller. Test after each movement to be sure you didn't over advance. This also needs to be done when the roller and ramp shows signs of long term use wear reducing the originally designed advance.
A lot of good information here Thanks for sharing!
Glad it was helpful!
9.9 is an above average Johnson. Im restoring an old 1958 Evinrude 18hp. This video was a huge help! Thanks M8!
Thanks
keep up the good work
Great job brother 👏
There awsome motors I had one and it always started right up 2 pull after sat all winter
they are reliable, thanks for watching
I also had a 15hp model and it was one of the best motors I ever owned..sold it when I sold the boat
They are reliable for sure.
Since you use Snap on get a 1/4 Dr. 7/16 universal socket 6 in extension and after you remove pull start you can get the nut off the carb real easy.
Just subscribed from the UK. Really like your easy presenting style, and very interesting to follow. I want to find another one of these outboards and get it in the water.
Welcome aboard!
Great video!
thanks for watching
Happy I found your video, I think it confirmed what I was suspecting about my 60hp of the same generation (1993). I had noticed the owners manual shows the 60hp and 70hp have the same displacement and I thought it must be pretty easy to convert the 60 to 70 if the block was the same. I wonder if anyone has done the conversion for that motor and if its the same parts to change (carburetor and reed plate spacers).
Nice video, I learned a lot. Thanks...
Glad it was helpful!
Mike I really enjoyed the video of you working on this motor I sent you another request of information and I hope you answer but thanks for being online I will continue watching thank you
Thanks for watching. Much appreciated
Best video instruction out there... well done and I just suscribed. Knowledge tips are excellent too.
Awesome, thank you!
You will find the 9.9 and 15HP are identical in all areas except the 9.9 carby is a detuned 15HP, they do this by adding a sleeve in the venturi tube and changing the jet sizes, kits are available for this purpose maintly aftermarket suppliers, but this is also common with the Mercury 7 and 10HP as well as afew other motors...
Great Work , Thank you
Welcome 👍
you know this is a great video about outboards
I also bought a 9.9HP motor only to find out, much to my delight, that I had a 15HP motor. Many owners found out that taxes were higher for 15HP motors than for 9.9HP motors so cover swaps occurred. The covers were an identical fit for either motor. Cheap swap.
They also did that because some lakes have a 9.9-10 HP limit on them (15HP on the down low); they just had to hope the person inspecting the boats and motors didn't know the model year and HP are part of the SN on every OMC outboard.
You can fix that horrible crack in your floor very easily - get a roll of foam backer rod that will fit and some self-leveling caulk at your local masonry or big box lumber yard. Push the foam into the crack - can use a couple of rows on bigger cracks - and then fill with self-leveling caulk. It will sometime form a big bubble but just pop it when it does and it will level itself out. This is what we do in commercial construction jobs when we have this problem. If you want a concrete finish, then use self-leveling concrete. You can use it instead of the caulk or over the top of the caulk by leaving it down a little bit below the service, a half-inch should do.
Great video thanks so much
Glad you enjoyed it
From a marine technician to you having worked in the industry for 26 years 10 of them for an OMC dealer there’s no way that’s not the original impeller and whatever parts they gave this aren’t from this motor. impeller wasn’t melted but the rubber was laid over like it been that way forever ,and the keyway was stuck.
Thanks for the info.
@@Michaelsbackyardmarina You’re welcome good work and good channel if you’re ever interested I have lots of marine parts .I started out working for an old timer who is now 89 and he specializes in old motors that large dealerships wouldn’t work on he taunted us to repair things not change parts . He was a stickler for no come backs PS I have subscribed to the channel 👍
That’s really awesome!!! Maybe this year I have two Johnson’s I will be working on...my first experiences with boat motors. I had no idea about the change from long to short shaft.
You can do it!
I've got a 91 9.9 electric start long shaft, thing runs great.. matches my 1990 60hp tiller.
The value of these old 9.9hp motors are up, pd $300 for mine.. will easily sell for double
It's because all the new stuff prices are driving up old stuff prices, thanks for watching
I can't find part two to make a comment. I wasn't going to subscribe to you just because I subscribe to so many already, but darned if you aren't such an easy guy to listen to and you know your stuff. The other thing I like about old motors is the smell of 2 stroke mixed fuel exhaust. It brings back so many memories of past trips
Oh! I found part two on my television just not on my phone.
Hey thanks for watching. Glad you found part 2
I have a 9.9 evinrude outboard ,I found out that pulling the flywheel makes it easier to remove and replace thw pull starter , I like your vidoes thank you keep up thegreat work .
Thanks for the info, thank you for watching and commenting.
@@Michaelsbackyardmarina you are welcome , I would like to know where you are located please . I have miht have 2 outboards I would like to possibly trade for one good prefer at least 20 hp
@@edwardnorlander6212 I'm in eastern Iowa. What two outboards are you talking about trading in?
I have the same engine. Great outboards
Yes they are!
short shaft / long shaft measurement"
I believe you measure from the top of the transom to the cavitation plate
You are correct
Good day, a correction should be made about proper mounting height of the outboard. The anti-ventilation plate {the wider wing on each side of the gearcase}, should end up between flush with the center bottom of the hull and up to 1.5" inches below it. If it is mounted any lower it will act like a hook and create drag, or if mounted higher the prop will over ventilate and you may end up with less water being sucked up by the water pump. This rule may be different with boats set up for racing, but they also different or modified parts to achieve the desired result.
Thanks for the tip. Been a whole bunch of folks commenting about my mis speaking about this. Thanks for watching
Up through the mid 90's a lot of local legislature made you register boats with engines 10hp and over. A 9.9 cover on a 15hp was an easy work around.
Love it👍
Just have to change the carb and reed valves . Same exact block and bore as a 15
How's she goin'? Just found your channel and subbed!!! I had a Evinrude 9.9, almost the same as this one. Around the same year too. I had heard that a 9.9 could be made into a 15 with a different carb. Great tip on changing from short to long shaft though!! Looking forward to watching more of your channel!! On my channel I do a little of everything and I have a 14 foot Princecraft with a 20 Evinrude. I have plans to make the boat a center console and have the Evinrude tuned up. So I will be watching your channel for some tips and ideas!!! Take care!!
@Alan Kropp Thanks for the tip!!!
Instruction manual page 1 GAIN ACCESS to and remove the bolts
I have found strait bleach works very well out of a spray bottle for cleaning my 1974 Johnson Seahorse 7and one-half HP. when it gets really dirty.
I should have said the outside of the motor, only the white painted part
I will give that a try.
I have a 97 suzuki 9.9 with the 15hp setup on a 12' fiberglass johnboat popular mod around here .🇨🇦✌
Very nice.
Nice camera work!
You get my thumbs up for using a pry bar instead of a screwdriver!
On these motors under power head there is a rubber grommet on copper water pipe from water pump.
Many swell closed in salt water.
Motors would overheat.
Clean around grommet and put anti corrosion grease on aluminium.
Did dozens at dealership
7.5-15 same motors.
Good motors
Hey mate can I pick your brain? I have a 15hp that I cant find anything about online. my model number is AJ15BACUD Cheers.
@@danzawraith8104 sure what's wrong?
Had one of those motors for 20 years. I knew the secret.
great viedo !!!!!!
What a great video. Learned a lot and enjoyed how you shared all the information. Definitely subscribed and looking forward to more of your videos.
good job thanks
Thank you
Anymore, if you work on carbed engines, go on amazon and order a wide band o2 sensor and gauge for like 50 bucks.. the best way to tune a carb is actually being able to see the fuel ratio out the back door.
You can "Tune by ear" and get sorta close but not as close as actually seeing the AFR's
Pick up a couple horsepower and/or tune for economy.
Easier too. you dont need to run plug checks
I've also seen the Johnson 15s make around 30hp with some intake and exhaust work.
I would also like to recommend open your plug gap to .046. 6 over recommended seems to make a little better power on almost every engine.
those flat plugs are complete garbage. Hell anything with more than 1 electrode is garbage.
02 sensors and carb synch tools like that are only for 4 strokes . no way are you able to get 30hp out of these without some MAJOR port, carb, exhaust and head work. even then i'm skeptical.
30mph on a Gheenoe.
Had one of those on a little 12 ft Sea Nymph. No wonder it was so fast! Always seemed hot for only 9.9
I replaced fuel pump and recoil spring good gas. Still wouldn't start. Checked my gap and it was set at 28000 regapped to what you said 40000 still didn't even try to start. Went and bought new plugs Ql77jc4'. Checked gap and it was preset at 25000. Put the new plugs in and guess what ? Never ever heard it run so good. Checked online and 30000 is on the chart for this motor. Not sure what up just glad to finally getting it running. Was a nice video though.
I wish it was as simple as that nowadays... I have a 15hp 4 stroke Suzuki. Identical to the 20hp except they put a restrictor plate behind the intake, and the timing is different. Only way to step it up is to change the computer