| 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 (21T)
A 21-tooth countershaft sprocket for a Norton gearbox, part 06-0721.
This is the countershaft sprocket off a Norton gearbox, 21 teeth, part number 06-0721. It sits on the gearbox output shaft and is what the primary chain wraps around before it drives back to the clutch and engine sprocket. Tooth count matters here since it's part of your final drive ratio, so if you're swapping one in, count teeth on the old one before you assume it matches.
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Our catalog record on this one is thin - it only turns up in a single listing tied to 1975 - so we don't have a broader spread of models or years to point to. If you're sourcing this for a specific Norton, give us a call and we'll go over fitment before you commit to it.
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