| Also known as | T3891 |
| Diagram | Fig. 8 — GEARBOX SHAFTS AND GEARS · ref 3 |
| Subsystem | gearbox |
| Listed in parts books | 1970 |
HIGH GEAR 650 26T 68-70
High gear, 26 tooth, for the 650 gearbox, catalog span 1968-70, also known as T3891.
57-3891 is a high gear (mainshaft fourth gear) with 26 teeth, listed in the gearbox shafts and gears section of the parts books for the 650 twins, covering the 68-70 catalog span. It's also known under the earlier T3891 number, so if you're working from an older parts book that's the number you'd have found it under.
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This gear lives inside the gearbox on the mainshaft, part of the cluster that gives you top gear. If you're rebuilding a box that's worn or jumping out of gear, or you're chasing noise or slop in top gear, this is one of the pieces worth pulling and inspecting closely for chipped or rounded teeth.
We show one catalog listing for this part across the 68-70 span, so pull your own gearbox and check tooth count and shaft fit before ordering to make sure it matches what's already in the box.
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