03 Yz 450 Valve Replace

1 reply to this topic

Posted January 22, 2008 - 09:45 PM


hey. re-building the top end of my bike, was told to think about new valves as i was told this years valves have a tendancy to fracture, bike has quite afew hours on it but not alot, any advice greatly appreciated.thanks.

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  • grayracer513

Posted January 22, 2008 - 10:53 PM


The main reason that YZ450 valves break is that they don't get replaced when they show signs of wear. If they have never needed a valve adjustment, they aren't worn, and will most likely be OK. If they have been shimmed more than .10 mm from where they started, they should be replaced.

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