| Diagram | Fig. 5 — Gearbox: Shell, Gear Cluster, Mounting Bolts, Adjuster and Countershaft Sprockets · ref 28 |
| Subsystem | gearbox |
| Listed in parts books | 1975 |
Norton Sprocket, Countershaft (20T)
Gearbox countershaft sprocket, 20 tooth, part number 06-0931.
This is the gearbox countershaft sprocket, 20 tooth, listed under part number 06-0931. It sits inside the gearbox shell on the countershaft, splined to take the primary drive chain that runs back to the clutch and engine. The tooth count is the key spec here - 20T - so if you're matching up an existing drivetrain, count teeth before you order rather than going by looks alone.
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The catalog record we have for this one is thin, a single entry tied to the gearbox cluster and shell figures. If you're chasing down gearbox internals or a full rebuild, this is the piece that carries drive out of the box and onto the chain, so wear here shows up as chain stretch or rough running that won't tune out.
Given how sparse our record is on this part, give us a call and we'll confirm it matches what's already in your gearbox before you commit to the order.
Sorry if we got something wrong here. If you think this information isn't correct, .