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  1. #1
    Buaidh No Bas howestek's Avatar
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    Jetting and Premix

    I searched the Premix threads and couldn't find the answer. I rebuilt a 1999 gp800 and am going premix. Engine is stock. Carbs are stock spec. I will probably break it in with Yamalube, then go synthetic. The WOT ratio is 30:1. That seems like it will be leaning out the fuel:air mixture a bit.
    Question: For a stock ski, should the jetting be changed to account for the leaner mixture, or would turning the screws out take care of it? Or, is it nothing to be concerned about?


  2. #2
    Moderator OsideBill's Avatar
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    I ran 32:1 premix Yamaglue when I broke in my 65U motor no issues, then I went to 40:1 synthetic. I ran the screws out a bit for break in then dialed them in after I was comfortable. I hope this helps

  3. #3
    the 65u is slated for 50 to 1 but I run 40 to 1 also for peace of mind and to keep all my ski's on the same mix but your correct the 800 pv 66E is slated for the 32 to 1 not sure I'd run less than that? I'd open my screws a little and keep a close eye on the pistons for a while then decide if I need to rejet IMHO Z

  4. #4
    Buaidh No Bas howestek's Avatar
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    Thanks for the responses. I'll turn the hi speed out another 1/4 turn and the lo side out another 1/2 turn to start. Sound about right, or would y'all go more?

  5. #5
    DAGO RACING CREW 97GPSLEEPER's Avatar
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    Quote Originally Posted by howestek View Post
    Thanks for the responses. I'll turn the hi speed out another 1/4 turn and the lo side out another 1/2 turn to start. Sound about right, or would y'all go more?
    That should be plenty.

  6. #6
    I would probably leave the low speed alone or go 1/8 to 1/4 turn at most. 1/2 turn on the lows is a country mile and you're going to be way rich.

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