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2003 yz450f

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I was tearing down the bike to check the valves because it wasnt running well the last time out and discovered all the coolant either boiled off or leaked out. Radiators and pump impellar seem fine and the bike has compression. Other than valves, what else should I check as far as the motor goes? This is my first four stroke and am a little more than unfamiliar with it.

Thanks in advance.

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