| Diagram | Fig. 3 — CRANKCASE · ref 12 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1971 |
BSA Tachometer drive assembly complete
Tachometer drive assembly, complete, listed in the crankcase section of the parts books.
This is the tachometer drive assembly, complete, as listed under part number 70-9428. It shows up in the crankcase section of the parts books, which tells us it's driven off the engine itself rather than being a cable-only affair bolted on somewhere else.
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The catalog record we have is brief - it names the assembly and places it at the crankcase, but it doesn't spell out which specific machine it was fitted to. The manufacturer tag on this one says BSA, but we can't confirm that against the description alone, so treat it as unconfirmed.
If you're trying to match this to your bike, give us a call with your frame or engine number and we'll work through fitment before you order. Tach drives are one of those parts where getting the wrong one means it just won't turn.
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