SURGING AND BOGGING DOWN

Yamaha DT 400 discussion forum:


SURGING AND BOGGING DOWN

SURGING AND BOGGING DOWN 
macintyreservice said 2009-03-11 18:28 
 
I Have 1977 dt400, carburator needle valve clip position is in the middle slot, and it surges at slow speeds, if i move it up one notch, then it will not surge as much and then begins to break up at igh rpm,s and if I move it down one notch, the throttle runs away from you at an idle, got complete other carb, and switched it and it does the same thing.If I go to far down on the setting it gets worst, and to high on the setting it gets worst the other way, please help. 
 
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