After really looking into it I have to agree. If you had precision machining equipment (which I don't) It might be worth trying. But any inconsistency would definitely have a negative effect on performance. I read a review somewhere on the NCY version of this pully with the 2 grooves and the reviewer said that the race groove allowed the transmission to hold in the high gear when letting off of the throttle and also made the acceleration smoother but didn't notice any top end gain. So I agree xlint I think modding a stock pulley without access to a precision machine shop would be a bad idea. I would also love to hear from jman before making a decision.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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