Who has changed their's to lower your RPM's at highway speed and what pulley did you go with?? I know you can go from a 30T to a 31T without issues and i've heard that one from a harley will fit. Does anyone know which ones??
Here is the text from another forum on the subject.
My comment: I'm really surprised that the Harley pulley will fit on the splined counter shaft of the 950. The HD pulley being made in the USA and the 950 being Metric. Hmm?
Answer: It doesn't fit. What happens is they take the Yamaha pulley off and machine it smooth all the way around. Then they cut out the interior of a larger Harley pulley and fit it over the Yamaha one. Then they weld the two pieces together to make a new larger pulley. Very precise machining and about $400 to have done but works great.
Good Luck Augie
I'm always working very diligently to discover the obvious.