| Diagram | CHAINCASE AND CHAINS |
| Subsystem | primary |
| Listed in parts books | Not catalogued by year yet |
Gearbox sprocket nut
Nut that secures the gearbox sprocket onto the mainshaft in the primary chaincase.
This is the nut that holds the gearbox sprocket onto the mainshaft, on the primary chaincase side of the bike. It sits behind the primary chain and clutch assembly, and it's what keeps the gearbox sprocket from walking off the shaft while the chain is doing its work.
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The catalog record we have for this one is thin, just the one listing tied to a single year. If you're chasing this down for a rebuild, it's worth double-checking the thread and fit against what's actually on your gearbox mainshaft before you order, since we don't have more detail on this one to go from.
Call the shop if you want to talk through fitment before you commit to it.
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