I'm in this one last time.
A Comet CTV works great with a 212cc. SBP are unreliable (casting flaw) may have been rectified.
Hilliard = Short service cycle, they work, and cheap. Relatively speaking.
Extreme Duty Centrifugal Clutches - Go-Kart, Racing Kart, and Youth Snowmobiles (hilliardextremeduty.com)
Bully single disk centrifugal clutch. Costs more than most bicycles. Ordered from Sportsman Flyer the clutch is set for the engine application. Unlike conventional centrifugal clutches, the Bully clutch stays locked until the engine rpm is almost at idle speed. Which means the clutch allows engine braking when off throttle.
SPORTSMAN FLYER CENTRIFUGAL CLUTCH BY BULLY | SPORTSMAN FLYER MOTORBIKES
Dustan I purchased a 3D motorsport manual clutch with a 3/4 bore on sale. Could be yours, if i can break even.
Fasteddy/Steve has a 3D on his Indian Tadpole.
3D Motorsport- Manual Clutches for Go Karts and Mini Bikes – 3D Motorsport Engineering
Tom