I chose the NCY pulley on mine, I had my cover off lastnite to check it all out, and my belt looks fine. I have roughly 5 fullhrs ride time with my set up and it all looks A-ok to me. Idk what the difference is between the motorio pulley and NCY pulley, my NCy also has the race groove
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MASTERBATES
TM 150 XRX-P&P head,A13cam,opened exhaust,140 main,38 pilot,adj cdi, perf coil,115mm variaitor,12 gm rollers,NCYpulley,2000 rpm springs,racing clutch,taller rear tires,and etc. 
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