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blown valve cover gasket?

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One of my riding partners has an 09 kx450 with around 10 hours on it, the other weekend he was riding and stopped for a minute, when he started off again pooof...looked down and oil was running down the engine..it had blown the valve cover gasket out in 3 places around the cover....what could have caused this???

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Did you check the breather hose on the flywheel cover?

If the bike had more time on it I would check the piston for a crack in the dome

that would let compression into the bottom end.

Does the bike run ok?

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We will probably look into it this weekend...just didn't understand that happening...will post what we find as soon as we check it out..thanks

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