| 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 (23T)
23-tooth Norton gearbox countershaft sprocket that drives the final drive chain.
This is a gearbox countershaft sprocket with 23 teeth, cataloged for a Norton gearbox rather than a Triumph one. It's the sprocket that sits on the gearbox output shaft and drives the final chain back to the rear wheel, so it's a wear item you check whenever you're replacing the chain or the rear wheel sprocket.
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Our catalog record for this one is thin - it shows up once, tied to Norton gearbox internals covering the shell, gear cluster, sprocket, and mounting bolt. If you're sourcing this for a Norton gearbox rebuild, have your gearbox casing and shaft in front of you to confirm the spline and mounting arrangement match before you order.
Given how little detail we have on file, give the shop a call with your gearbox particulars and we'll make sure 06-3420 is the right sprocket for what you're working on.
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