| Also known as | 10-0347, 68-809 |
| Diagram | Fig. 3 — CYLINDER BARREL, EXHAUST PIPES, VALVES · ref 41 |
| Subsystem | engine top |
| Listed in parts books | 1969–1970 |
BSA VALVE GUIDE A65 63-70 STD .501 - KWPM (MNG BRZ)
Standard .501 manganese bronze valve guide for the BSA A65, 63-70.
This is a valve guide for the BSA A65, standard size at .501, made in manganese bronze. The catalog description ties it to A65 engines built in the 63-70 span, and it shows up in the shop's records under the CYLINDER BARREL, EXHAUST PIPES, and VALVES figures.
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A valve guide sits in the cylinder head and keeps the valve stem running straight as it moves up and down, so the valve seats squarely every time. Manganese bronze guides are a common choice for this kind of application because the material holds up well against wear from the valve stem over time.
This is a BSA part, not a Triumph part, despite whatever bin it landed in around the shop. If you're rebuilding an A65 top end, check your guide size against the .501 standard listed here before ordering, since oversize guides exist for engines that have had the guides reamed out at some point.
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