Details
| Diagram | Fig. 1 — CYLINDER AND CRANKSHAFT · ref 66 |
| Subsystem | engine bottom |
| Listed in parts books | 1969 |
BSA Bottom cup, valve spring
Bottom valve spring cup, part number 40-1018, seats the valve spring at the base in the cylinder area.
PN · 40-1018
This is the bottom cup for the valve spring, sitting down in the cylinder area where the valve springs seat. The catalog lists it under the CYLINDER AND CRANKSHAFT section, which tells us where it lives in the engine, though it doesn't spell out which specific model or engine family it was cataloged for beyond the one entry we have on file.
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