BSA Crankshaft Balanced
BSA A7/A10 offset crankshafts are usually supplied with the standard timing side journal ground to 1.500” size as used on 1959 and later A10 engines. Crankshaft diameter, with counterweights, is about 3/8” smaller then a stock crankshaft to clear any high-lift camshafts and reduce the rotational weight of the crankshaft. Our crankshafts are usually 4.5 pounds lighter than a stock crankshaft.
Donor large-journal BSA A10 crankshafts are very hard to find. The price can be dropped by $150 if one is supplied. Remove the flywheel before shipping; we’ll take care of the sludge trap. All 76 degree versions of BSA cranks cost $200 USD more than quoted prices shown below except where noted.
This crankshaft costs $1350 USD with stock timing side journal and $1500 USD with roller bearing conversion.