i have a rock solid stage one motor that has done the sameas the rest its a realy cheep motor well all of tham are thay are cheep cast and thay do need a steal sleve in the borrels and way im over spending money on cheep motors thay whay i went with a blata motor the morinis are good to id advies if any one is looking for a real motor for thare bike look at italy thae home of mopeds there motors rev hard and can tak it all day any way thats just my 2 cents as i have spent over 1500 just on motors and know thay are just sitting there as all the brrols hve no lining left eny one else with the same prob out there