| Diagram | Fig. 11 — CHAINCASE AND CHAINS · ref 1 |
| Subsystem | primary |
| Listed in parts books | 1974 |
Gearbox sprocket (19 th)
19-tooth gearbox mainshaft sprocket that drives the primary chain inside the chaincase.
This is the 19-tooth gearbox sprocket, the toothed wheel that sits on the end of the gearbox mainshaft and drives the primary chain back to the clutch. It's cataloged under the CHAINCASE AND CHAINS section, so it lives inside the primary chaincase alongside the chain and engine sprocket, and it's part of what sets your primary drive ratio.
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The part number carries the tooth count right in it - the /19 tells you this is the 19-tooth version, as opposed to other tooth counts sold under the same base number. It also shows up in older records under the alias SPR5T/19T, so if your parts book or an old invoice lists that number, it's the same physical piece.
Our catalog record for this one is thin - it only turns up in a single listing tied to 1974. If you're matching this against your own gearbox and primary case, bring the old sprocket in or give us a call and we'll confirm before you order.
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