| Diagram | Fig. 3 — CRANKCASE · ref 7 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1970 |
BSA Engine sprocket (28 teeth)
A 28-tooth engine sprocket for the BSA B44, mounted on the crankshaft to drive the primary chain.
This is the engine sprocket, 28 teeth, listed under part number 41-0615. It lives at the crankcase end of the primary drive, where it takes power off the crankshaft and feeds it into the primary chain on the way to the clutch and gearbox.
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The catalog title ties this one to the B44, so this is a BSA part rather than a Triumph one despite how it's filed here. If you're trying to match this against a Triumph engine, hold off and check the tooth count and chain pitch on your own primary case before ordering.
Our records show it appearing in crankcase-related listings across 1969 and 1970. Give us a call if you want us to confirm it against your specific machine before you buy.
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