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Don`t put a smaller one on the front.I did that on my mojave and I can`t believe how much slower my top end is.My friend has a 86 230s with a pipe and I would say Y2K300ex is right he tops out about 50-55mph.
I have an 88 with a bigger front sprocket. It does seem to pick up a little bit on top. Didn't lose much on the bottom either. I think that it could hang with a 250X or a 300EX.