| Diagram | Fig. 1 — CYLINDER HEAD, EXHAUST PIPE · ref 23 |
| Subsystem | engine top |
| Listed in parts books | 1969–1970 |
BSA Valve spring (outer)
Outer valve spring for the cylinder head, part number 65-2494.
This is the outer valve spring listed under 65-2494, showing up in the cylinder head and exhaust pipe sections of the parts books between 1969 and 1970. Valve springs work in pairs on most Triumph and BSA cylinder heads of this era - an inner and an outer spring stacked together to close the valve and keep it seated against the seat when the cam isn't pushing on it.
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The catalog record we have on this one is thin - two appearances, no partner spec sheets to lean on for wire diameter or free length. If you're rebuilding a head, it's worth pulling the old spring out and comparing it against the new one before you commit, especially given the tag on this part points toward BSA rather than Triumph despite it living in our system. Call the shop if you want us to check it against your specific head before you order.
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