My dad bought me a RV 90 from some guy for $125.00. Obviously it didnĀ“t run well. The guy he bought it from snaped the piston rings and scratched the cylnder and piston. We had to get a oversized piston and bore the cylnder. We have also had many more diffuculties with the bike. I have spent over $800.00 on this bike on repairs because I dont have a manual to tell me how. If anyone has any manuals please help me with my motorcycle.