| Also known as | T4657 |
| Diagram | Fig. 11 — GEARBOX SHAFTS AND GEARS · ref 16 |
| Subsystem | gearbox |
| Listed in parts books | 1973–1974, 1976–1980, 1983, 1985 |
LAYSHAFT 2nd GEAR c/w bush
Layshaft 2nd gear with bush for the gearbox, catalog number 57-4657 (also T4657).
Part number 57-4657 is the 2nd gear for the layshaft in the gearbox, supplied complete with its bush. It shows up in the catalog under GEARBOX SHAFTS AND GEARS and GEARS — SHAFTS — SELECTORS — STARTING MECHANISM, so this is a piece that lives inside the transmission, riding on the layshaft alongside the other gear pinions. The bush that comes with it is what the gear actually turns on, so replacing the two together as a set is how the part is sold.
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The older book reference for this same part is T4657, which you'll see if you're working from an earlier parts book or a bike with the letter-prefix numbering still on file. Catalog records for this one span 1973 through 1985, which tells you it was in the system across that stretch, though we'd want to check your specific gearbox before assuming it's the right one for your year.
If you're pulling a gearbox apart and finding wear or chipped teeth on the layshaft 2nd gear, this is the replacement piece, bush included so you're not chasing down a separate bush order. Give us a call with your frame or engine number if there's any doubt about fitment before you order.
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