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NOT ENOUGH REVS?

MY SONS 50CC DIRT BIKE WONT REV, STARTS WELL BUT JUST WONT REV ENOUGH ANY IDEAS PLEASE
I TOWNS, February 2009
most likeley problem is a blocked exhaust if its a 2 stroke engine which i expect it is

adam bike doctor, February 2009
could be main jet in carb blocked.

rayb, February 2009