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Thread: GPX 338F stock clutch tuning

  1. #1


    Default GPX 338F stock clutch tuning

    I hope there are some on here who remember the old stuff. 1974 GPX 338 with stock primary clutch and stock secondary. What primary spring should I use to get my engagement up to 4000-4200. I know I'll have to adjust y secondary but I need to get engagement up to get into engine power band. Currently it engages at 3600-3800, Depending on how fast I rev it up. It has what I think is a stock spring with a shim washer. I'm guessing the spring is wore out. I would like to race sled in pure stock vintage drags.

  2. #2
    Senior Member Mod Yamaha Nutz's Avatar
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    yellow/white from a 76 ex 440 should do the trick part # 90501-55403-00
    TOO MANY GPX'S
    TOO MANY SRX'S
    A FEW EXCITERS
    A FEW SS440'S
    SOME PHAZERS
    A 2000 VMAX 700 WITH OVER 14,000 MILES AND COUNTING

    JUST TOO MANY SLEDS AND NOT ENOUGH TIME

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