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Thread: Lean vs Rich

  1. #1
    750slt's Avatar
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    Lean vs Rich

    Does Lean mean too much air and not enough gas and Rich means too much gas and not enough air? Is this correct?


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    ujustlost's Avatar
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    yes, if your going to error, error on the rich side and then adjust from there as needed. Mike

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    ADSR's Avatar
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    Quote Originally Posted by ujustlost View Post
    yes, if your going to error, error on the rich side and then adjust from there as needed. Mike
    +1

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    750slt's Avatar
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    i know if you have too much air and not enough gas you get a hole in the piston. correct? And if you have to much gas and not enough air you still get a hole in the piston. Correct?

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    ujustlost's Avatar
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    running to lean will burn a hole in the top of your piston, running to rich will cause fouled plugs among other things but not a hole, detonation will cause a hole as well. It's a matter of ration fuel to air and octane of fuel as well. Mike

  6. #6
    750slt's Avatar
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    1) How do you fix running to lean?
    2) How do you check ration fuel to air?
    3) What octane of fuel do I use?

  7. #7
    ujustlost's Avatar
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    open your high's on the carbs a little, then back them down as needed. On a 750 I would run mid-grade or regular.

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    750slt's Avatar
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    mid-grade or regular with ethanol or no? and do you mean by opening my high more means to unscrew it?

  9. #9
    ujustlost's Avatar
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    Yes unscrew the high about an 1/8 or a 1/4 turn. Well almost all gas has some ethanol in, usually no more than 10%

  10. #10
    Pain is fear leaving your body.... rlovebk's Avatar
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    I just did mine. My ride is a '94 slt, blue Fuji motor. Mikuni sbn38's.
    Lows are at 2/3 on mine. (factory 1/2) Factory setting is 1/14, 3/4, 7/8, on the highs. I don't know what year your ski is, so I dont know if this applies...
    The lows on mine are the screws towards the front, or bow of the ski. The highs are the screws facing back, or aft.

    If you start with them out 1/4 turn further out, you aren't going to hurt anything. (highs)

    Start with them turned all the way in. Do not force them in further than nomal turning pressure will allow. (dont crank 'em in, screw your seats)
    Just turn in to where they no longer turn in easily, then notice what time your slot is at, (like 1&7 o'clock, for example) and go from there.
    Good luck. !!!

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