| Diagram | Fig. 7 — INNER TIMING COVER, GEARCHANGE MECHANISM · ref 40 |
| Subsystem | engine bottom |
| Listed in parts books | 1969–1972 |
BSA Split pin — quadrant plunger spring (3/32" × 5/8")
A split pin, 3/32" x 5/8", that secures the quadrant plunger spring in the gearchange mechanism.
This is a small split pin used in the gearchange mechanism, specifically to secure the quadrant plunger spring. It shows up in the inner timing cover figures where the gearchange quadrant lives, and its job is simply to keep the plunger spring assembly from walking out of place as the mechanism cycles.
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Given the size listed, 3/32" by 5/8", it's one of those parts that's easy to overlook until it's missing or buggered up from a previous removal. If you're in there doing selector or quadrant work, it's worth having a fresh one on hand rather than trying to reuse a bent original.
The catalog record ties this to appearances spanning 1969 through 1972, but we don't have more detail tying it to a specific model beyond that. If you're unsure it matches what's on your bike, call the shop and we'll confirm before you order.
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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