| Also known as | 68-205 |
| Diagram | Fig. 5 — CRANKCASE · ref 3 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Engine sprocket (28 teeth)
A 28-tooth crankshaft engine sprocket that drives the primary chain, cataloged for BSA production from 1969 to 1972.
This is a 28-tooth engine sprocket, mounted on the crankshaft end where it drives the primary chain out to the clutch. It shows up in the crankcase and generator-area sections of the parts books, so it lives right where the primary chain picks up drive off the crank. The catalog data ties it to BSA production runs from 1969 into 1972.
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The alias 68-205 is just the same part number without the dash spacing some catalogs use, not a different piece. If you're chasing a worn or skipped primary chain, a stripped or hooked sprocket like this one is worth checking, since it's the first link in that whole drive train.
We don't have model-specific fitment details beyond the BSA A50/A65 tie mentioned in outside listings, so if you're not certain your engine takes this exact tooth count, give us a call before you order and we'll confirm it against your crankcase.
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