Out of curiosity, what are the main known weak links on a Commando? Here’s the ones I know of, please adivise if different: Starting from the head and working down and back... Head: RH4s know to crack. All others OK? Rockers and valve gear OK? Pistons: Slotted 750 type known to break. All others OK? Rods: have been known to break, but generally considered OK. Cam: Some later cams found to be soft and prone to wear. Crank: Flywheel known to break up. PTO shaft known to break where it meets the cheek. Crank cases: Known to break under racing conditions and occasionally on the road. Combat issues with main bearings and oil return ? Primary: Bronze clutch pack puts heavy weight on main shaft. Otherwise OK? Gearbox: Case known to crack between bearings, mainshaft known to flex (causing the aforementioned?). Layshaft bearing weak on later models. Otherwise OK? Rear wheel: Two piece wheel spindle known to break. Please let me know if I’ve missed, or miss represented any know weak points.