| Also known as | AA78 |
| Diagram | Fig. 14 — PRIMARY TRANSMISSION AND OIL PUMP DRIVE · ref 4 |
| Subsystem | engine bottom |
| Listed in parts books | 1974 |
PAD,CHAIN TENSIONER A65
Chain tensioner pad for the primary transmission, listed for the BSA A65 and the 1974 Triumph 750 Trident, also known as AA78.
This is the chain tensioner pad listed under 71-3221, also found under the earlier number AA78. The catalog description ties it to the BSA A65, and our own parts books also carry this number for the Triumph 750 Trident from 1974 - so it's a part that shows up in both marques' records. It sits in the primary transmission, working with the oil pump drive assembly to take up slack in the primary chain.
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The pad itself is the wear item that rides against the chain, letting the tensioner mechanism keep tension steady as the chain stretches with use. Given its low cost, it's a sensible thing to have on hand rather than wait until the primary case is already open.
Our records don't give a BSA year range for this part, and the Trident listing is 1974 only. If you're matching this against an older or later machine, check your own parts book against the AA78/71-3221 numbers before ordering.
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