Details
| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 69 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
BSA Inner valve spring
Inner valve spring for use in a dual-spring valve setup.
PN · 40-1007
This is an inner valve spring, listed in the catalog under the CYLINDER AND CRANKSHAFT figure. On engines that use dual valve springs, the inner spring works alongside an outer spring stacked over the same valve stem to help control valve closing.
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