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  1. KFX PROBLEMS

    Pictures and Videos
    HELLO, EVERYONE IM NEW TO THE WHOLE THING ABOUT THIS KFX 450R, IS THE FIRST TIME I HAVE A FULL INJECTION MACHINE AND NOW I HAVE A PROBLEM WITH IT THE MACHINE WILL START AND IDLE BUT WHEN I GIVE IT GAS START BACKFIRING AND THE ACCELERATION IS BAD IF I GIVE HALF WAY THROTTLE THE BACKFIRE IS MORE...
  2. 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...
  3. Running very badly

    Engine/EFI/Drivetrain
    I have an '08 kfx 450r that just recently started running very badly. It started when I took it to a riding place that turned out to be extremely muddy and coated the quad brown. While I was there it started to be hard to start, and bogged down when I gave it throttle every once in awhile. Since...
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