Had a lot of tiddlers over the years ,stroker are good if you want good speed for size but need a bit more looking after 4 stokers normaly give better life span but not so quick good strokers are AR50, RD50, DT50, TS50ER ,X1,simpson, fizi, AP50 ,and RS50 , good 4 strokers ummm honda ! and if you do cbt get an old TZR 125 with YPVS very strong stroker and a real 100 mph !