| Also known as | T1591 |
| Diagram | Fig. 5 — GEARBOX SHAFTS AND GEARS · ref 13 |
| Subsystem | gearbox |
| Listed in parts books | 1963–1964 |
Layshaft cluster (17T) Std.
Standard 17-tooth layshaft cluster for the gearbox, also listed under the earlier T1591 number.
The 57-1591 is a layshaft cluster with a 17-tooth gear, standard spec, out of the gearbox internals. In the older parts books it was listed as T1591, so if you're working from an early catalog or a bike with the original tag still on the box, that's the number you'd have seen.
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This one lives in the gearbox shafts and gears assembly, on the layshaft, which is the intermediate shaft that carries a set of gears between the mainshaft and the gearbox sprocket. The cluster is the machined shaft with its gears cut or pressed on as a unit, so when it wears or a tooth gets chipped you're typically replacing the whole assembly rather than a single gear.
Our catalog record ties this one to appearances from 1963 to 1964. If your box is outside that window, give us a call and we'll go over the numbers with you before you order, since gearbox internals changed enough over the years that it pays to double check.
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