If you want a conversion engine there are plenty to pick from made in China. Most need some good made american bearings...ect. Maybe a good hub...not a cast one....some have broke that had thin walls. Then there is the "put it together engine"....you do the assembly. On some you may want to replace the ignition to a RCxcel or CH unit. Not all bad if you want to learn how they tick! Capt,n