Question about 2001 Yamaha YZ 426 F

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A rattling noise coming from the engine.

The noise is between a rattle and a spining noise.It does not rattle when it is idleing but it does when the choke is on or if you hold the throttle open a little bit. I thought maybe it was the timing chain tensioner but I replaced that and its not the problem. The valve clearance is good, and i put new rings in it.

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  • jim horton May 11, 2010

    This sure sounds like a cam chain. Do you know the proper procedure for adjusting the cam chain? Look it up because it is kind of strange.

  • Anonymous Mar 12, 2014

    when opening throttle tapping noise from front of engine

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Could be your Flywheel,The yz426 has a riveted flywheel,over time these rivets wear from the flywheel spinning around,causing a "rattling sound"or it may be your timing chain is loose or has been stretched.

Posted on Jul 02, 2009

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Clutch baskets are a common problem in those bikes.

Posted on Jun 23, 2009

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Ride Safe
Steve

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