lets keep it simple for those of you who think new is faster----------think in terms of cc's 250cc 2 stroke should and will walk all over a 400 cc 4 stroke ---now when your dealin w/85/86 quadracer i just would not put to many drags on one of those-- its like a stick of dynamite under yur as$--- i would never buy a 4 stroke there for the weak-and the weak deserve no mercy-- 2 stroke for life and for the record i have owned 87lt250r and a quadzilla ,now i got my 87 trx250r and theres no comparison in reliability