| Also known as | 68-0657B, 68-648, B319D |
| Diagram | Fig. 4 — CRANKSHAFT · ref 24 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
TIMING BUSH BSA 650 .020
Timing-side crankcase bush for the BSA 650 twin, .020 oversize, superseded by 68-0657B.
This is a timing-side bush for the BSA 650 twin, listed in the .020 oversize. The catalog entry itself is short, and the manufacturer tag on this record says Triumph, but the description plainly calls it out as a BSA 650 part, so this one belongs on an A65-family engine, not a Triumph unit twin.
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A bush like this lives in the timing side of the crankcase and gives the crankshaft its running surface. The .020 designation means it's an oversize bush, used when the crankcase has been bored out that amount to true up wear or damage, so this isn't a part you'd swap in on a standard-bore case.
Our records show this number was superseded by 68-0657B, so if you're chasing this by an older parts book or a previous order and it's come up short, check under that number too. Since we don't have much more written down on this one, call the shop and we can confirm details before you order.
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