2003 Polaris Predator 500 timing keeps jumping

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i have a 2003 predator 500 and the timing keeps jumping off time the tensioner is good but i have scuffed many parts over this deal. i need parts and help any sugestions???? i need a set of valves and a piston and sleeve all standard bore.

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I always recommend Service Honda for OEM parts, they are much cheaper than getting parts from a dealer. If the tensioner is still good and is adjusted properly, you probably have a worn timing chain and/or sprockets.

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