4 strokes don't make all that great of bashers either. They require more maintence (valves, springs, pushrods ect) and because of the very low RPM when you put a 4 stroke in an RC made for a 2 stroke you have to completely change the gearing and on some RC's there just isn't enough gearing options to give the 4 stroke decent top end. a small block 2 stroke will see 35,000rpm pretty easily on a high speed run.. a 4 stroke will be lucky to see over 15,000 rpm so top speed if you didn't change the gearing would effectivly be cut in half.

OS is/was making a 4 stroke engine for 1/10 touring cars. I think its called the FS26C or SC or somehitng like that. I remember reading aobut it a while back but they only recomend it for very small track and on road Rc's that have very wide gearing options to cope with the limited RPM of the 4 stroke.