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  1. #1
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    Yamaha superjet tuning troubles

    Im trying to help my buddy tune his sj and we are having trouble.


    The ski has a factory bpipe mod
    Ada head with 35cc domes
    Taucetti f/a


    For jetting we are using
    75 low
    135 high
    2.0 needle seat
    90 gram spring
    Both high and low are out at there max and it's still running lean.


    Based of my research this should be fine but it's not!!


    Any suggestions?
    1998 SuperJet
    1994 Wave Blaster

  2. #2
    PWCToday.com Is My Home Away From Home TMali's Avatar
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    Re: Yamaha superjet tuning troubles

    What year superjet?

  3. #3
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    Re: Yamaha superjet tuning troubles

    2013
    1998 SuperJet
    1994 Wave Blaster

  4. #4
    Top Dog Benflynn's Avatar
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    Re: Yamaha superjet tuning troubles

    Use the factory pipe settings off the instructions, they should be really close, mine with same set up they were spot on.

    Anytime I can't get a carb to react correctly I swap out crank seals, they will have you running circles with jetting

  5. #5
    I dream skis JC-SuperJet's Avatar
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    Re: Yamaha superjet tuning troubles

    Both Low and High Speed Adjustment Screws should only be about 1-1/2 turns from closed.

    There may be some air leaks at the Carburetor Base/Intake Manifold or Exhaust Manifold. Remove the Carbs and "dress" the gaskets(both sides) with sealant, then reinstall Carbs.

    Do the same with the exhaust manifold and head pipe gaskets. Make sure ALL the Exhaust Manifold bolts are torqued properly. Specially the two bottom ones. You will need to grind a wrench to properly reach the nuts.

    If that doesn't work and assuming the Carbs were reassembled properly, there might be other air leaks. You would then need to do an Air leak down test to find the other leaks and fix them.

    What are the cylinder compression readings?
    Last edited by JC-SuperJet; 09-25-2017 at 10:52 PM.

  6. #6
    PWCToday.com Is My Home Away From Home
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    Re: Yamaha superjet tuning troubles

    Seals and gaskets are a good start, do you have aftermarket fuel lines? If so put back on the stock lines.

    Edit: Also check for a leaking primer.
    Last edited by driftmaster; 09-25-2017 at 11:21 PM.

  7. #7
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    Re: Yamaha superjet tuning troubles

    Quote Originally Posted by driftmaster View Post
    Seals and gaskets are a good start, do you have aftermarket fuel lines? If so put back on the stock lines.

    Edit: Also check for a leaking primer.
    The jetski is a 2013 with low hours on it. Completely stock prior to adding these parts.When my buddy installed the factory pipe manifold he broke a bolt in the cylinder. He removed the jug had the bolt fixed and replaced the base gasket. He did not use sealant. We got a new base gasket and are adding some sealant. I think that is why we were getting whacky readings!

    Compression is 180 180
    If we are still getting lean results that are all over we will be doing. A leak down.

    Thanks everyone!
    1998 SuperJet
    1994 Wave Blaster

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