| Diagram | Fig. 5 — GEAR CLUSTER · ref 111 |
| Listed in parts books | 1969–1970 |
BSA Spring, cam plate
Cam plate spring for the gearchange mechanism, part number 40-3042.
This is the cam plate spring for the gearchange mechanism, part number 40-3042. It works inside the gearbox, keeping tension on the cam plate so the gear selector indexes cleanly from one gear to the next rather than slipping or hanging up between ratios.
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In the parts books it shows up under the gear cluster and gearchange mechanism figures, which is where the cam plate itself lives. If your bike is shifting vaguely or feels like it's not quite locking into gear, a tired or broken cam plate spring is a common cause and worth checking while the gearbox is open.
Our catalog record ties this to appearances across 1969 to 1970, but we don't have a specific model spelled out, so confirm fitment against your gearbox before ordering.
We've never carried this one. Tell us what you're after and we'll go looking — you'll get a price and photos before you commit to anything.
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