| 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 (24T)
Norton gearbox countershaft sprocket, 24 tooth, part number 06-3421.
06-3421 is a gearbox countershaft sprocket with 24 teeth, out of a Norton parts record rather than anything Triumph. It lives inside the gearbox shell along with the gear cluster and mounting bolt, per the figure grouping it appears under, and it's what the primary chain rides on to carry drive out of the box.
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Our catalog record only shows this part turning up once, tied to a 1975 listing. We don't have more detail beyond the tooth count and its place in the gearbox assembly, so if you're trying to match it to a specific Norton model, give us a call and we'll work through fitment with you before you order.
If you're pulling your gearbox apart and comparing sprockets, count the teeth first - a 24T countershaft sprocket is a specific ratio piece, not a universal fit across every Norton box.
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