My rebuilt 300 is slow to take off. If I go to take off slowly, without letting the clutch out above 5,000 rpm, it almost dies. Before my rebuild it seemed to go a bit better taking off calmly. Jetting hasn't changed, seems like it could be a powervalve thing, but I've got them set correctly though I'll double check that tomorrow. Can't think of what else it could be.
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MC21 Honda NSR250. TYGA 300 conversion.