| Diagram | Fig. 1 — CYLINDER HEAD, EXHAUST PIPE · ref 20 |
| Subsystem | engine top |
| Listed in parts books | 1969–1970 |
BSA INLET VALVE B44 1967-70 (Square Barrel)
Inlet valve for the BSA B44 441 Victor square-barrel engine, 1967-70.
This is an inlet valve for the BSA B44, the 441cc Victor single, covering the square-barrel engine built from 1967 to 1970. It lives in the cylinder head, where it's the intake side that opens to let fuel-air mixture into the combustion chamber before the cam and rockers snap it shut again.
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This is a BSA part, not a Triumph part, even though it sits in the Triumph-heavy catalog here. If you're working on a square-barrel B44 in that year range, this is the valve the parts books call for on the inlet side.
Valves take a beating from heat cycling and don't last forever once they're worn, so if you're doing a head refresh on one of these engines this is worth checking alongside the guides and seats while everything's apart.
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