Good recall Ludwig the Harley Peashooter got a lumpy cam with a bit more lift and duration as well as a reworked head; porting, polishing, cc'd chamber, lighter/larger valves, stiffer springs and lighter piston. A small bit of compression increase and a real Mikuni along with a performance CD I. The little motor required a good bit of tuning and fiddling to get up and running, but has held to tune pretty well. Cold natured though and requires a proper warm up prior riding, but worth the wait. I've no idea how much power was gained, but enough to say the cost was worth it though it would have been cheaper to just put a 200cc 5 speed in and ride it!
My Simplex "Copper gator" with the same engine & 5 speed, though stock, and 40 lbs. heavier and geared lower (56 t vs. 44 t final) isn't really a fair comparison with the Harley. The Simplex is quicker off the mark but the Harley quickly recovers as the bike comes on cam at mid range and really pulls with power at higher rpm's. Both are fun, just really different to ride. Rick C.