swapping the
Engine is kinda sacrilege on an old ody unless its beat to crap. You can do plenty to soup up your fl250 if you want though. I would start with finding a 1973-9174 cr250 cylinder jug and head. These jugs make somewhere around 28 hp give or take compared to the 17 that the stock fl250 has. The CR250 cylinder and head will bolt right on to the fl250 bottom end. From there put in a cr250 piston for higher compression, buy an aftermarket reed cage intake manifold for the cr250, swap on a 38mm carb such as lectron. make sure your Engine has a
CDI (Capacitor Discharge Ignition) ignition not a points ignition. k and n air filter, dg exhaust, and comet 102c clutch are all easy things you can do to soup it up. you can even find a DG head or a watercooled head for it. after all this you will have a machine pushing double the original hp, which will be a hell of a ride without rear shocks