just stripped the A50 motor and checking the bushes for wear. Ive got the genuine green 500&650 unit construction twins workshop manual.
in the manual it says the kickstart bush inside diameter should be 0.750/0.751", mine is 0.875". the outer cover is 0.781"and not bushed.
was this a later mod and the manual is earlier? is there a service sheet for bush diameters?