Mikuni 38mm

It's a good idea to start a fresh motor with a carburetor that (you know) works, or has proven itself.   Then you aren't flooding or starving your motor of fuel during a crucial "break-in" period.  I've seen bad results from incorrect jetting, starvation, washing the walls, etc.  I know this Mikuni works - it's broke in about 6 motors now.

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