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2008 yz85

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My son does desert racing he is on a 2008 yz 85 stock with some suspension work. Bikes shut down during the race and won't start. Yes it does have fuel(lol), seems like it doesn't have compression ,how do I know if it needs a new top end or check compression.  Thanks 

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Take the tank and cylinder off and inspect it. there is no power valve so its barley 1/2 hour work.

Start by reading the service manual.

Good Luck

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Thanks GCannon, I pulled the carb and cleaned it,it is getting gas, feels like it has compression, the spark plug has spark and it is getting fuel, just won't fire. Thanks

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