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  1. #1
    Ziggy's Avatar
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    Am I too fat? (jets)

    I've had a quirk with my 951 GSX-L that has me a bit puzzled. Riding in the rough or jumping it will try to foul out, but most times I can clear it by feathering the throttle for a minute or so(but not always). I'm thinking I may be hitting the limiter and then fouling the plug(s)??

    Some specifics:
    Shaved head (PPG did the work) 160 psi +/-
    PTO: 172.5/85 Mag:170/85
    2.3 N&S; stock spring
    choke plates operational (no primer)
    Prok filters w/ outerwears

    I have a single 167.5 jet and a single 170 in my toolkit. I was thinking of putting the 167.5/85 on the Mag and the 170/85 on the PTO and see what happens.

    Am I in the hunt, or am I barking up the wrong tree?
    Thanks!


  2. #2
    Why so rich on the mains? I am running 165's on my 2000xp with proks.

  3. #3
    96XPSS's Avatar
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    I would say you need 165 mains, no reason to go 170's with that compression.

  4. #4
    Ziggy's Avatar
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    Quote Originally Posted by Piranha Performance View Post
    Why so rich on the mains? I am running 165's on my 2000xp with proks.
    This poor engine has been through several setups. I first set this ski up with a jet kit from Watercraft Magic years ago, and then put a Coffmans on it. I was always running abnormally high EGTs and ended up putting much larger jets on it. After dumping the Coffmans I backed down to the settings listed above. I guess I shoulda backed off a bit more, huh?

    Back to the problem, it ran fine until activities that would have put me on the limiter, and then it would lose a cylinder. Unfortunately it's been so long I can't remember which one - they may have even alternated.

    This is the engine that's going into the XP-951 project, and I'd like to get the jetting right before I put the carbs on.

    Where's a good source with a good selection of jets? Looks like I'm going to need some.

  5. #5
    I get my carb parts here. http://www.atlanticjetsports.com/jetting.htm

    As for getting the jetting right, i would leave everything you have in there, but change the highs to 165. Open the high needle 1/2 to start, and go in from there. Should be real close.

  6. #6
    GOO$E Mongoose2's Avatar
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    i'd go to 160 or 162.5...your way too rich....we run between 155 and 157.5 with 95 or 100 lows

  7. #7
    Ziggy's Avatar
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    Quote Originally Posted by Mongoose2 View Post
    i'd go to 160 or 162.5...your way too rich....we run between 155 and 157.5 with 95 or 100 lows
    Wow, that sounds really lean for a 951. The 95 or 100 lows I could see if running without an accelerator pump, but those main jet numbers are way below stock - and I'm running Proks. The total numbers look good, but I've never heard of anyone running that setup. Can you say what your rational is to run this way? I'm interested...

  8. #8
    KrunchovXPL-GTX-RX's Avatar
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    +1 on 165 mains with 85 pilots (95s w/o pump).

  9. #9
    Hydrotoys's Avatar
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    did you do a pop-off check on your carbs?

    2.3 NS are NOTORIOUS for dumping fuel at any given time or reason.

    Another trick is to double up your oblong clear check valves in the jet-block. This will prevent dribbling, from both vibrations and impacts.

  10. #10
    GOO$E Mongoose2's Avatar
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    Quote Originally Posted by Ziggy View Post
    Wow, that sounds really lean for a 951. The 95 or 100 lows I could see if running without an accelerator pump, but those main jet numbers are way below stock - and I'm running Proks. The total numbers look good, but I've never heard of anyone running that setup. Can you say what your rational is to run this way? I'm interested...

    no accel pump....

    all depends on the squish...timing...and setup....as to what you can get away with..... my x4 has 157.5/100 on 44 cc pent domes with 27 degress of initial timing......and it runs on 93

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