yeh 49cc bike shouldnt be a problem just not bothered to look at it considering i was at it all day sunday fixing riding bla bla bla, yeh i dont know jack about 4 strokes, ive sorted it out and am going to put a 125cc 4 speed in it with a yamaha miki carb, should be fun huh, does anyone know what kind of speeds i should be looking at with that?