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Raced on sunday worked perfect. Pacticed tues. After first moto it started to backfire and the top end seems very noisey.

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If the bike is a 2 stroke, decarbon the head and piston and install a fresh spark plug. If it is a 4 stroke, chances are you have an intake valve going bad. Decarbon as above, re-seat the valves and consider using premium gas if not already doing so.

Posted on Jul 18, 2010


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