The lighter the roller the higher the rpm needed to move that roller up the ramp. The motor will only make power up until 7500 rpm even if a no rev limit cdi is used. With lighter rollers the top rpm limit will be reached before the top power curve. Lets make it simple , you have a 3 speed manual trans. Now you replace 1st gear with granny low ( lighter rollers) and third gear becomes second gear. Top end speed will be reduced.
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