| Also known as | T1549 |
| Diagram | Fig. 10 — CLUTCH · ref 3 |
| Subsystem | primary |
| Listed in parts books | 1960–1962 |
CLUTCH WHEEL PREUNIT 43T
43 tooth single-row clutch chainwheel (clutch basket) for pre-unit Triumph/BSA engines, PN 57-1549.
This is the clutch chainwheel for the pre-unit Triumph engine, PN 57-1549, a 43 tooth sprocket that also serves as the clutch basket. It's the part that receives drive from the primary chain and carries the clutch plates, so it sits right in the primary case between the engine sprocket and the gearbox mainshaft.
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The catalog lists this as a single-row 43T unit for pre-unit machines. It's also cross-listed as a BSA fitment, so the same basket shows up in both marques' pre-unit parts books.
We don't have much more detail on file for this one beyond the tooth count and pre-unit designation. If you're not sure whether your engine takes the single-row or a different tooth count, bring in your old chainwheel or give us a call before ordering.
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