BSA Spare Parts Book Copy A Model A7/A10 500cc and 650cc A7 500cc OHV Rigid Frame A7 500cc OHV Spring Frame Star Twin 500cc OHV Spring Frame A10 650cc Rigid Frame A10 650cc OHV Spring Frame
BSA B33 Piston +020= 85.5 mm 1946-1953 Hep 11341+20 65-1260Compr. ration 6.8:1slight rusty rings to be used with flywheels 65-1235 and 65-1235 to be used with conrod 66-482 Piston Clearance 0.12mm or 45thou Compression Height: 31mm Piston top - Gudgeon pin top: 22 mm Gudgeon pin diameter: 19 mm for long conrodwith gudgeon pin, circlips and piston rings
BSA A10 650cc. Cylinder Head Plunger used. inlet 1.1/16"OD of exhaust manifolds 1 5/8" ca. 42 mm for restoration - no warrantyPlease look at all pictures