DIY dudeJP 1 I installed on my scooter. One problem is the hole for the bolts are not compatible. I have to cut and adjust the bracket just to fit in. 2nd problem is very poor performance. Even though i changed the high speed pulley,the clutch spring and the center spring. My scooters top speed decreases. Even i exchanged the rollers the top speed does not change. My overall opinion this is a bad product. But it seems good on the outside but performance wise it is very bad. Buy it on your own risk.