| Diagram | Fig. 6 — GEAR CLUSTER, CAMSHAFT · ref 7 |
| Listed in parts books | 1969–1972 |
BSA Idler pinion — with spindle
Camshaft gear cluster idler pinion with spindle, BSA A65-era timing gear part.
70-9104 is an idler pinion with its spindle, listed in the gear cluster and camshaft section of the parts books. This is the pinion that sits between the camshaft gears, transferring drive from one gear to the next without changing the direction of rotation the way a directly-meshed pair would.
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The catalog places this in the camshaft gear cluster across appearances from 1969 to 1972. Other catalog listings tie this idler to the A65, so if you're working on a BSA A65-family engine from that era this is worth checking against your timing chest.
We don't have more detail on this one beyond its place in the gear train. If you're not certain this is the right idler for your engine, call the shop and we'll confirm fitment before you order.
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