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nope alomg as if you jet it correctly for the 70 kit there is a guide somewere i seen last week about what jet size to use on a standerd carb if...
there will be a bit more top speed from the 21mm as it will be putting more fuel in at top end and 4.5g sounds about right for a 70 kit and carb...
when its at 25 is it revving high or not?
