Please help! Power delivery change? - Page 2
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  1. #11
    Senior Member american opel's Avatar
    Join Date
    Sep 2012
    ashtabula ohio
    sounds like porting,pipe reeds carb jetting to me.

  2. #12
    Senior Member 2Nubs's Avatar
    Join Date
    Jul 2018
    Quote Originally Posted by american opel View Post
    a good pipe makes alot of the difference and a 38mm will give you more topend but hurt down low where you want it.
    I will echo this statement. If your jetting is proper, change the pipe. The 38mm probably isn't helping things on a 67.5mm bore. I run a 39mm on a 330 and sometimes wish I had a 38mm.

    You are correct on the gearing. Your small gearing is best for getting more rpm's at a given speed vs bigger gearing. I run a 13/38 myself for the tight woods.

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