04 crf150f jetting
  • PimpWagon
    Posts: 2
    Joined: Sun Dec 03, 2017 8:53 pm

    04 crf150f jetting

    by PimpWagon » Sun Dec 03, 2017 9:00 pm

    I just put on the pro circuit t4 full exhaust system and also put on a k&n filter and removed the snorkel piece. The bike runs fine with the stock jets (90 main 40 pilot) but it sounds like it hits a rev limiter when it’s full throttle in 5th gear. It never did this before. Does this have something to do with the jets?
  • Back2-2
    Posts: 1148
    Joined: Tue Jan 04, 2011 3:31 pm

    Re: 04 crf150f jetting

    by Back2-2 » Tue Dec 05, 2017 10:55 am

    By changing the exhaust to a free flowing unit you are now allowing the engine to breath easier and that translates to higher RPM's. You should do a plug check to be certain you are not running lean. I would suspect you need to go up 2 sizes on the main jet and possibly 1 up on the pilot. That is just a guess but from what you described it sounds like you really opened it up for more air in and out which means you need to add fuel to that equation. If you are truly hitting the rev limiter you have a choice of an aftermarket CDI that allows higher RPM limits or learn to back off at that limit point.
    Neil
    Black Hills of SD
    Life without Motorcycles would just be boring, really boring
    Honda 450X. Yamaha Tracer GT900. HD Fat Boy. Triumph Bonneville. Yamaha Majesty 400. Yamaha Grizzly. Yamaha Wolverine. Yamaha TW200

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