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loud gear box noise

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when putting my 2010 yz250f into gear it some times make a loud clunk noise as it engages. only some times. my geAR BOX IS STILL really smooth and doesnt seem like any thing wrong with it. is this normal or not?

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How long do you go between oil changes? Also, is you chain adjustment somewhat loose? Is your chain rubbing block worn thru? I would think that a worn item in the transmission would not be intermittant.

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i do 8 hour oil changes. im not very fast and dont ride sand much. the oil is still pretty clean when i take it out. ok thanks ill have a look around. its only done 34 hours. nothing should be to worn?

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Most likely what you're hearing is the chain on the sprocket. Is the bike idling high when it happens? Is the clutch adjusted properly. Mine does it all the time

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