What are the best Frames to put differnt motors in and what are the best motor to put into these frames?

 

i am a big fan of the 250r/400ex geometry frames. i love that type of based frame stuffed with either a 426 or 450 bike engine, a powervalved 350r engine, or a 250 or 500 2 stroke dirt bike engine. i my own opinion go for the yfz450 quad that is now out. for the price you are already gettin the best of both worlds, awesome chassis and a killer engine package.