BSA Crankshafts

BSA A65 Crankshafts

BSA Balanced

BSA Balanced

BSA A50/A65 offset crankshafts are supplied with the standard timing side journal ground to standard (1.500”) size as shown in the image below.  The 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.

This crankshaft costs $1300 USD

All 76 degree versions of BSA cranks cost $200 USD more than quoted prices shown below except where noted.

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BSA Crankshaft Timing Side Bearing

BSA Crankshaft with QuillBSA A50/A65 offset crankshafts can be supplied with the timing side bearing machined to fit a needle roller bearing.  The oil feed quill is ground so that it is concentric to the crankshaft’s main bearings.  The 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 BSA crankshafts are usually 4.5 pounds lighter than a stock crankshaft.

This crankshaft costs $1400 USD

All 76 degree versions of BSA A65 or A10 cranks cost $200 USD more than quoted prices shown with related information.

BSA A10 Crankshafts

BSA Balanced 1BSA 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 $1400 USD with stock timing side journal and $1500 USD with roller bearing conversion.