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  1. 2009 kfx450r dies while riding.

    Engine/EFI/Drivetrain
    I’ve been struggling trying to figure out what’s wrong, it will be running great then cuts out, backfires, and bogs then dies. This happens at different lengths of rides from a couple blocks to 40 miles. I will turn it off and back on the fuel pump cycles, all fuses are good, cranks just won’t...
  2. Can't get rid of this stutter...

    Engine/EFI/Drivetrain
    I'm trying to mess with my procom and get rid of this mid-rpm stutter. From 5-7k rpm it bogs, stutters and pops and idk what to do to tune it out. Little history... Last year around October i sent my quad to a guy to work on it- port & polish, stage 2 hot cams, JE 12.8 piston. Soon as he has...
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