| Also known as | 116038X80 |
| Diagram | Fig. 9 — CLUTCH AND PRIMARY CHAINCASE · ref 43 |
| Subsystem | primary |
| Listed in parts books | 1969–1972 |
PRIMARY CHAIN BSA A50/65
Triplex primary drive chain for BSA A50/65 twins, listed under PN 19-8639.
This is the primary chain for BSA A50/65 twins, a triplex (three-row) endless chain that runs between the engine and clutch inside the primary chaincase. The description on this one is straightforward on that point: PRIMARY CHAIN BSA A50/65. It's not a Triumph part despite how it's filed in our system, so if you're wrenching on a Triumph don't reach for this one.
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The part also carries an older alternate number, 116038X80, which is worth knowing if that's what's printed in your parts book or on old packaging - same physical chain.
We don't have much more detail on file for this one beyond the description and the cross-number. If you're not sure this is the right length or link count for your bike, call the shop and we'll confirm before you order.
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