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2009 crf ticking noise

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Hey so I just shimmed my valves on my 2009 crf250r and it now starts easier but makes a pretty loud ticking noise out of the top end... any ideas? i made sure the lines were in the correct orientation on the camshaft and that it was at top dead center. is there any other way to check timing? is it possible my cam chain didn't tighten correctly? any help is appreciated thanks!

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We're the valves too tight before? Could be too much tolerance between lobes and shims/buckets. Sometimes it's hard to accurately get the gauge in for measuring.

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