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Thread: Big Bear Knocking please help!

  1. 01-23-2010, 12:48 PM #1
    odogracing
    odogracing is offline Gettin it done!
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    Jul 2008
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    Jefferson, GA
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    Unhappy Big Bear Knocking please help!

    I just finished replacing piston and rings in a YFM400_Big Bear. Fires up great however once engine warms up it begins to have a slight knock. I have check valve lash and everything appears ok. Any ideas of what I can check? I have verified everything I know, valve lash, timing chain tension, I'm now at a loss. This only happens after about 5 minutes of running. HELP PLEASE!!
    Tim O'Donnell
    www.odogracing.com
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  2. 02-26-2010, 11:32 AM #2
    roadthrills
    roadthrills is offline Senior Member
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    Northern Arkansas
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    Have you double checked the timing already?
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