I have a good running polini xp 4 pit bike. its the 4 stroke 107cc pit bike. Comes stock with disk brakes, 107 cc engine ( swapable with the crf and xr 50 stuff) has 4 speed manual clutch) Great suspension no sure on the specs. 2800 $ new when purchased. 3rd gear has started to jump for some reason so Id like to trade it for a 636 i can stunt out dont need a title . Id even trade it for the parts to build one. (all the parts but just not put together) 712-204-3955 shot me a text and i can send up pictures of it.