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Carburetor tuning. Tricks & Tips to get the your ski BRAPPING!!! Mikuni carb setting up for power!!
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- Опубликовано: 20 июн 2020
- In this video i show you some of the tips and tricks i have learned over the years to tune Pwc engines.
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Please don’t take this vid down, I’m about to tune a ls2000 and this is the best resource I’ve found. Thanks
Real helpful vid, I'm not sure if everyone can hear the difference each time but to me it's sounding happier and happier every run and the end it sounds raring to go. Get the reed done and I'm sure it rips!! I just acquired a js550 88ish, it needs a tune up but I'm miles from water so this helps to know what I'm doing before I get there. Keep up the good work
Thanks for the info! I’m new to skis but not new to mechanics, this helped me out incredibly! 👍🏻
Same here just acquired one so doing a little research. This guy is very good at explaining. The sound is good on his vids too
Awesome work! Cant wait to watch the turbo jetski 😇
This video is gold!!! Thanks mate, really helped me tune mine
Thanks for watching. I'm happy it helped
This is an awesome video! How would I go about picking the correct spring/jets/NS for a 61x with factory pipe and wet jet 46mm intake/carb?
Great video. Thanks!
Thanks for witching
best video settings carb mikuni bro
Thank you was very helpful was wondering is it better have dual carb or single have 700 vxr pro single carb thank you
This is an extremely helpful video thanks for sharing 👍
Glad it was helpful!
@@EricksonMachinePerformance have a question i have a 97 GTi and have the top end rebuild ski runs well just its bogging out at first when i give it full throttle i would have to play with the throttle like tap three times so it won’t bog out once it passes that part ski runs smooth and good at full throttle what could it be to much fuel going into the carb ?
@@josecollazos6 that could be a rich or lean bog. First I would take the carb off and clean it
@@EricksonMachinePerformance well the carb was all clean as well when the top end was rebuilt i just got it back and took it and was doing that and then i took it back to the shop and they adjust the screw half a turn and it’s still doing it . They went out half a turn so i called the guy and now he said try going in a turn and half
@@josecollazos6 if you want email me your # Ericksonmap@gmail.com
Does reading rpm’s also help with a tach? Like reading for highest rpm? Or should I just rely on plugs? Just wondering. Got my skis tuned in now thanks to this vid!
Hello, I am rebuilding my Yamaha 1100 mikuni sbn 38mm carbs. My question is what size needle seat do I need I’ve noticed that their r different sizes. My ski is stock other than Boyesen power reeds. Thanks I’m not sure of the stock size however is there any power to be found in going to a bigger seat size if possible? Thanks again I trust your knowledge more so than many other opinions on the web.
Just curious what should that tan plug look like when you put it back in and just run it normal, not WOT then look. At it?
great advice. Thanks.
Glad it was helpful!
maravilloso ,marvellous
My ski has good low end but dies when i give it full throttle from idle. Also seems to have an occasional mid range hesitation. Would this be too small a main jet?
Motor and carb are fresh. Already at a 165m 127.5p. 61x superjet with single 44 sbn. Mild porting, milled head and rotated exit cast AL wet jet kraze pipe. 800ft elevation.
So if I'm still running oil injection can I pull off the airbox hat & do this (I have 50:1 In the tank for initial break in anyways). Thanks for the awesome videos!
Do u have it on a hose for when it’s outta the water
Love the video, i will have to try tuning m 650 SN with a coffman with your method. Cant seem to get it to run perfect
email me your # ill walk you through it. i will have another video coming out soon of signs to look for if your popoff or jetting is wrong. this video will work great if your jetted correctly email me ill get u sent up. Ericksonmap@gmail.com
Did you ever figure out the best settings? I have the same setup lol
Great video. Couldn't hear to well. What were you twisting with the pliers?
The adjustment needle screws
Great Video. Your porting templates for my 701 worked great by the way. I just rebuilt a 760 for a sit down, fresh bore, pistons, crank seals, full mikuni carb kit, mikuni needle and seat, good pop off (low 30's). Reeds look ok, but ski has a dead spot if throttle is snapped open from stand still. Runs fine in midrange and WOT. Did notice a small spray out of one of the carbs occasionally when I snapped the throttle open. Adjustments dont seem to do much (and its a pain in the ass to get to the 44's low speed screw). Anyway, I'm thinking reeds. Does this sound right or should I look elsewhere. thanks
Take the air box.off and leave it strapped to the trailer and do a wot pull for 8 to 10 sec and see if its spitting
So this is my problem and yes it is spitting. What should I do now?
Question I have is does this tune affect each plug separately because it's a dual carb setup and other question is on a single carb setup does it cause different readings on each plug the same or no?
Yes
So the screws only adjust the very high end and the very low end. How are you tunning the mid rage pull, pop off, and jets? How can you tell if it's lean or rich in those areas. My WB2 760 is atuddering at 1/4 to 3/4 throttle but ripps wide open and runs fine at idle
Correct that would be set with ur popoff, n/s & springs. Email me your setup ill be happy to help
I see your registration says new jersey, what part if you dont mind me asking? I have a polaris slx 780 that I rebuilt, it runs pretty good at wot but bogs down when you first accelerate
its a customers ski but my shop is im freehold nj
nice, you adjusted the back pot not the front..;) Also noticed your idle speed increased and you left it there, is that preferred? kinda on the edge of running away.
When the idle speed starts to raise its still no where near running away. Its just the start of that. I get it to that point an back it off until it sounds crisp and the rpm doesn't hang when it revs back down. Also when tuning the high and low screws don't always end up being even which is what ur seeing in the video. 1 hole can need to be richer or leaner then the other
Thanks this was huge
Sabes la carburacion del vxr pro 701?
Good video but my 650 has a 3rd screw. Maybe the mixture screw? What do I do with that? Sorry I’m new to carb world lol
Kawasaki 650 have kehin carbs and some have 3 jets. One low, mid range jet, and high jet
So when adjusting the low speed screw, should I turn it out 2.5 turns and then turn it in until the idle starts to raise and then back it out a little and adjust for the most crisp idle? And turning the screws in is leaning it out and turning them out is making it richer?
Correct and Correct
for the low speed screw on a twin carb ski, should the both be adjusted the same or turn one until the idle picks up, richen it back up then do the same for the other? also i have the carbs of my ski at the moment and noticed that one of the throttle butterflys is slightly damaged because of excessive end play in the shaft, if it safe to use it like that for the season or should i fix it asap? they are twin 48mm full spectrums if that matters. also that water box sounds just like my straight piped ski
I turn them.in at the same time. But.odds are if the butterflys are damaged replace that first. If u want Emil me pictures and I can tell u will the need to be replaced. Ericksonmap@gmail.com
@@EricksonMachinePerformance thanks, i'll see if i can get some pictures tomorrow, i'm not worried about getting it tuned 100% right now, just don't want to do any damage to it if i keep riding it, i mean it could probably use a new set of reeds too
Vacuum test. Along with individual carb idle drop test. Determine jetting etc. Rookie
How much of the screw are you turning in and out each time are you just going 1/4 turn
It really depends on how far off you are normally pretty good at getting fairly close so it's normally either 8th a turn or quarter turn. But you can be anywhere from 3 turns out to completely closed. The more engines You ture the more you know if your almost perfect or far away and that kind of judges how much you turn the screw. Also if you can't tell if you're making something better worse sometimes better to do like a 1/2 a turn to make a big difference. If you understand what I mean.
what fuel ratio were you using when you did this video?
40 to 1
Hey man I need a built 701??
When do you change to hotter/colder sparkplugs?
I will be doing a video on that in the next month of so. It has to do with timing and compression, and can be seen on the plug strap
Can some one help! I have a js440. It runs great starts right up however. I have to go through a channel to get to my lake and its almost 5 mins. Low speed laying in the water. Sometimes I will get this condition. Where if you give it some gas it will lack power and bog down. No matter how much you gas it engine runs a little rough and struggles to pull you. Turn it off. Have a little bit of prolonged cranking. And then its usually fine after that. Any ideas. Pretty much all stock. Factory single carb
Check the needle and seat
@@EricksonMachinePerformance Thanks ill take a look
How many turns when backing low side screw out to start with ?
2.5-3
Have a 2002 waverunner, and never tuned the carbs (coming from a 2 stroke chainsaw guy), but just left them at the factory setting. I'm at 5500 feet elevation. The low is crisp. But, it might be rich on top, as the top speed is too low (around 40 mph, and it is a 50 mph ski). Do you think it is just carb tuning the high, or another issue. Runs great other than that (but almost at 500 hours without a top end or messed with).
Oh, it is an 800xlt 2 cyl. 2 stroke stock motor
can you email me more details and your # and ill try to point you in the right direction
Just a quick question, I’ve been using yamalube 2w. On an 96 Yamaha 1100, is their a better oil I could be using to better protect my engine? Thanks and have a safe day....
Yamahalube is a great oil
So is klutz ski craft
@@EricksonMachinePerformance ok that’s what I was thinking. Now should I stick with the older 2w or should I try the newer I believe tcw3rl 2m yamalube?
@@brandonpeeples7319 both would be fine. I have mainly used 2w
@@EricksonMachinePerformance thanks brother, have a good one...
for a dual carb do you bring both low end screws in at the same rate until you here the idle raise then back both out just a little?
Yes
@@EricksonMachinePerformance also do you have any vids on how to sync carb butterfly’s on dual mikuni carbs?
@@benselby6171basically back off the idle screw and then set the linkage so all are closed here is a video I did showing how
ruclips.net/video/Rm_IVQVAdwo/видео.html
Tried several times to get my low speed better but couldn’t. What could be the other reasons? I checked the colors of the plugs and it is pretty clean white color which I believe it is to lean but it feels that it is rich :( while coming back to wake for a back flip
Can u email me pictures of the carb butterflys and also a pic of ur plugs wot. Ericksonmap@gmail.com
Erickson Machine & Performance sure sure
Off topic, but why is the hull of that last ski taking on water when just sitting there? You made it sound like that was normal.
its got a scupper with a warn flap some older scuppers LEAK ALOT! but as soon as you hit the throttle it emptys the hull in seconds
Hahaha cavitation through the shaft bushing. Check shaft straightness etc. Rookie
could a leaking reed pedal cause a lean condition in 1 cylinder, I have a single carb 750sx that one plug is leaner than the other. Passed leak down test but I did notice one pedal of one reed does not seal like the rest?
Can cause it to run differently but not leaner. It's common for 2 holes to run differently tho
@@EricksonMachinePerformance Thanks for the info, I assumed being single carb they needed to be the same! That makes me feel better knowing it is common.
@@jamescrooker9239 always tune the leaner. You would prefer 1 carb be alittle to rich instead or to lean😉
At what point in the adjustment of the high and low needles should you go up or down a jet size? Basically, what is the optimal adjustment range of the needles?
When you run out of adjustment. If you are over 3 turns open or the needles are closed and the ski is still rich or lean. It doesn't make a difference how many turns your at if it's tuned correctly.
@@EricksonMachinePerformance on motocross bikes they say the max range is 1/2-2 1/2 before changing pilot jets so it’s about the same then. Thanks
@straighttimestirrups it depends on the carb. Mikuni SBN carbs use the Jet and the needle Adds fuel to that jet. So technically you can run the needles fully closed if you have the Perfect size jet for the engine. Some other carbs the needle blocks the jet so you can't have them closed completely. ( it really depends on the carb) not all carbs work the same
@@EricksonMachinePerformance cool information! That’s why I asked the question.
@@straighttimestirrups great question. I'll bring it up in the next carb video I do
Removing the oil injection do you need to change the jets
No you do not
What pop off pressure you running with and what would be safe pressure to start with
Every setup is different. Carb, pipe, engine size, ect.. could range from 16-55psi
@@EricksonMachinePerformance ok sorry I should of added 100% stock but with after market filters I found the previous owner had one carb above 55psi (same cylinder that threw the big end and other was 32psi , I’ve gone both with 32 standard jets and standard screw settings as a base don’t want to blow this customers motor after a rebuild
Sweet thanks for making it easy. 👍👍😁. Are you in Seaside in this video ?? Like and subscribed ✅
Thanks for watching!! Great eye Yes we are in seaside nj in this video
First comment, love the videos!
Glad you like them!
Stupisd question but ive read two things saying low speed fuel screws screw in to richen and out to lean. Is that correct?
Gp800r
NO. Screw in to lean.out.
@@EricksonMachinePerformance that's what I thought. Everything i ever worked on was like that. This thing is being a pita. Had a lean run away yesterday. Had to put my hands over the carb intakes to shut it down. I resealed the engine and didnt leak test it. I dont think its an engine air leak tho. I might leak test it but im about ready to take it to a shop. Whats the pop off on these? One was at 65 the other at 35. I set them both to 65.
@@libertyforamericanow ON A LEAN RUN AWAY just GRAB WIDE OPEN THROTTLE.
@@EricksonMachinePerformance any ideal on pop off pressure?
@@EricksonMachinePerformance dinally got it to start and idle. I was using a quarter inch impact with a angle driver on it to tighten the carb plate bracket. It wasnt getting it tight enough which is where my air leak came from. Now it idles and revs decent. Kinda shaky at idle tho. One low speed screw seemed to change rpm the other isnt having the same effect.
Might be a dumb question But is there A specific adjustment/specific amount of turns that the idle screw needs to be adjusted to like you did with the high and low screws earlier in the video ??
No every engine is different. You just set it where the engine idles at a decent rpm
You screw the low in till the rpms go up? Don't some carbs act the opposite of that? Then about how much do you back out? Seems tough to find concrete info on tuning carbs :/
Had my kawi 750 out today , first time since engine rebuild... Trying to make sure I don't ruin anything... I noticed I got peak RPM somewhere around 1/2 turn out on the low speed screw (keihin cdk2) Do you adjust it till you get MAX rpm at idle? I'm afraid I will lean it out too much?
YOU ARE NEVER LOOKING FOR PEAK RPM you read plug color. thats how you blow engines up.
low speeds open to 2.5 open there screw in untill it starts to rasie and back out an 1/8 of a turn. then i will adjust alittle to get the most responsiveness.
dont look at numbers LISTEN
@@EricksonMachinePerformance im talking about the idle/low speed adjustment, i thought you only check plugs on full throttle pull after plug chop?
Where do I start with my idle screw?
Start with the blades cracked open alittle and adjust until it idles at desired rpm
How much are you backing it off? Half turn?
Course adjustments are 1/4 to 1/2. Fine adjustments are 1/8 at a time
@@EricksonMachinePerformance great info thanks. Ski is running better then it has in years.
@@fabricobblegarage9545 awesome. I love to hear that!!
whats a lean runaway sound like? i dont know
the engine goes to MAX RPM and hitting the stop button wont kill it. when you dont know what you are doing its a scary situation. if seen people run away from there ski thinking its going to explode ( which will happen if you let it run away) if it ever happens to you pull the throttle wide open and hit the kill switch. Kind of the opposite you would think to do but you are choking the motor with air to change the air fuel ratio.
@@EricksonMachinePerformance Thank you tons Mark!! You should make an in depth quality carb tuning payed/premium video, I'd buy it!
@@zoidelux thanks for the support. Im thinking about doing a paid phone support thru Patrion or something like that because I have been over run with phone calls ( great problem to have but also time consuming for a 1 man shop). But for the foreseeable future all videos will be free. And the are some awesome ones coming soon!!
white,brown team
Drain plug in?
It's a freestyle ski with a scupper
They can leak. Alot
Mine running wide open when I start it !!
Sounds like the idle screw is holding the blades open 2 much, or the low speed screw or jet is to lean or there is an air leak
a stunt ski must have been used did you see a different ski at one point?
Stunt ski??? There where 2 skis in this video a Rickter and a Waveblaster. The waveblaster was mainly used to show the low speed adjustment because it's a single carb and easier to show the changes
Wish there was sound
Can you over speak on this?
You got some water coming in from somewhere
It's a freestyle ski with a scupper. It's always leaking
Need a boom mic
Unfortunately the way i made this video( me being in the water) I couldn't use my wireless Lav mic.
@@EricksonMachinePerformance thats why I said boom mic, that way you can be a good distance away and it'll still pick up everything you say without picking up to much background. You have all the good info to share but we need to be able to hear you! 😛
@@fopm008 I'm working on a test tank to make it easier. That way I don't have to be in the water to tune and can use my normal audio stuff. Unfortunately I don't have a crew of people helping.
@@EricksonMachinePerformance if you want help editing videos I'd be glad to lend a hand. Can do some post processing to get that audio better.
A leak in haul !!
Supper valves can leak when the flaps wear. Which is what you see in this video. They are only used in freestyle skis that get alot of water from putting the ski under water. Normally 1 brap of the throttle and the hull is empty
I really only recommend flap suppers for flatwater skis. Ball scuppers leak alot less! But that's not what came on this ski
since when is rusty brown a perfectly tuned engine?
on 2 stroke engines thats the color it works out to milk chocolate / rust ish color
some call it light tan some same tan to gray BUT may times when you start getting any white/ gray thats from a lean conditon
Hahahah it's not a 4 cycle valve engine. It's a reed cage. Hahaha. Rust ish color? Wow. The shop rep loves reading this crap haha. Working with the handicap lol
Shakes a lot
Not really its very common for Performance 2 strokes to have movement. It as the soft motor mounts.
Your plug will not change color within 8 second pull adjust and another 8 second pull that's no where near enough time to get any color change lmfao 🤣
Just a little FYI 8000 RPM every second the cylinder is firing 138 times. In 8 seconds it has fired over a 1000 times it's it a 100% changes colors on plugs try it before you make a comment..😉 I've been tuning research engines for over 20 years believe me it takes less than 8 seconds for the plugs to change colors.
The really amazing thing with spark plugs is how quickly they actually change color which is the reason tuner's Read spark plugs because it's the 1st thing that shows you when something is going wrong. I use 8 to 10 seconds because normally that's enough time to put the engine under load but not so long that you'll burn it down if it's set to lean. ✌️
Runs like shit.
Off idle you want to tap the throttle and there to be a quick crank with crisp throttle response
Exactly