Greetings from Ireland.
I am in the process of rebuilding a 1962 Model 50. I am going down the route of the BSA A65 (+ 40 thou) piston and overboring the barrel to 76mm to give 399cc.
Has anyone ran this and if so what piston to cylinder wall clearance do you run?
I would also like to know does anyone have any technical data on these engines relating to specific engine measurements.
Right now I am looking for OEM barrel height, cylinder head thickness, conrod big end ID and crank big end OD.