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Thread: 87 mm question

  1. #1
    just GOT TO DO IT! great lakes gpr 1200's Avatar
    Join Date
    May 2006
    muskegon michigan

    87 mm question

    I'm looking into having Lowell do a 87mm BB kit for me.. I have this for jetting now,
    1.5 needle valve
    95 gram spring
    120 main jet
    95 pilot jet
    I am at 500 ft above sea level mostly high 70* weather. half turn out on lows 1.5 turns out on highs.. Do ya think I need to rejet ?
    Of course porting is in the quote.

  2. #2
    HopatcongGPR's Avatar
    Join Date
    Feb 2006
    Missouri City, Texas
    imo, you should start with a 125m and a 115 pilot with the stock carbs. you will probably be ok with a 120 main and a 110 pilot, but i would start a little fat and monitor piston wash and rpm to be sure.

    hope that helps.

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