A local kid kitted one with a stuffy crank, 70 cc cylinder, longer intake for easier access, bigger carb, notched out the front variator, and a tighter belt. High 30's on level ground and high 40's downhill. With the carb up higher, he's getting soft seizes after cornering, and he also added a pull start from a Toro leaf blower back pack. Really seems to know what he's doing for the most part.
Any thoughts on preventing seizing?
Top speeds for these and PA50-II?