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engine tuneing

  1. New to jetting, need help!

    Dyno/Tuning Room
    Hey guys I'm new to the forums and could use some help with jetting my 02 400ex. I live in PA altitude around 1000ft. I have a unit air filter with no air box lid and a full white bros exhaust. I have no idea what to make my main jet size so any suggestions?????
  2. looking at big boreing my 450r

    Engine/EFI/Drivetrain
    I just wanted to see what is some good kits I been looking at the trinity kits but i don't know if that's the best I can get
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