07 yz 450 compresion

I have a 07 450 went to start feels like auto decomp. stuck on no pressure. cranks over by hand. removed valve cover all seems to be ok. Stuck ring,valve,??? please any info would be great.:thumbsup:

How many hours do you have on the bike?

did you check your valve clearance?My experience when the get tight if feels like you lose compression.

any update onthe low compression? ski

If you have alot of hors on it you may want to rebuild the topend and freshen it up.

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