Carb tuning after fresh builds - Page 2

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  1. #11
    PWCToday Newbie
    Join Date
    Jan 2014
    Knoxville, TN

    Re: Carb tuning after fresh builds

    That confirms my suspicion on the 115 gram spring. I have one of each at this point and thought at first it was a mis-package. That thread you posted puts my setup right in line with what others are doing, but doesn't seem to work. I am going to try a 107.5 LS jet as well as the 1.5 N/S next.

  2. #12
    Resident Guru JC-SuperJet's Avatar
    Join Date
    Jul 2013
    Cypress, TX

    Re: Carb tuning after fresh builds

    Make sure you use true genuine original brand Mikuni springs...

    Same goes for the Mikuni Needle Valves. The holes are very round and precise in their diameters. So a 1.5 Mikuni Needle Valve is exactly a 1.5mm round hole. Same goes for Jets.

    That way, when you copy somebody else's Mikuni jetting and engine set-up, you will get the same results, all else being equal.

    Another brand Needle Valve and Spring will work, but it will be a "one of a kind" set-up and costume tune job.
    Last edited by JC-SuperJet; 05-14-2018 at 11:25 AM.

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