i have new nrg.it has arrow racing exhaust,malossi variator and clutch.i did 15000 km in 5 months.i use 98 octans fuel&full syntetics oil.it can achieve 115,and more than 125 downwards...50 ccm!!!but soon i am going to input 80 ccm minarelli racing kit.140 km possible.perfect bike.lot of fun.there is no 50 that can match me.if anyone wants a mods advice just ask.