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1985 2001 2005 2006 250 250 clutch 250ex 250x 300ex 400 400 ex 400 ex trans problems 400ex 450r adjustment atv axle big bore kit bogging bolt brakes broken cam carb carb jetting carb problems carburetor cdi clutch compression electrical electrical problem engine engine rebuild engine wont start exahust exhaust fenders fuel fuel pump fuse help honda honda 250 honda trx honda400ex hot cams idle jet jets jetting lights live mods neutral light new guy new rings newbie nfl no spark noise performance piston plastics quad rancher rancher350 rear axle rebuild recon repair shifting problems spark stage 2 hotcams starter stream swingarm timing tires top end top end rebuild transmission trx trx125 trx250 trx250ex trx250r trx250x trx300 trx300ex trx400 trx400ex trx450r tuning valve valves video wire harness wiring wont start
  1. Engine/EFI/Drivetrain
    I just bought my first 400ex a little while ago and it is in great condition except I have a weird engine noise. It sounds like a knocking or something. It happens regularly. Usually around 3-6 seconds apart at idle. I can add a video tomorrow in order to help with ID-ing it.
    engine motor knock noise weird
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