| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 19 |
| Subsystem | engine bottom |
| Listed in parts books | 1974, 1976–1980, 1983, 1985 |
Motor sprocket, 29 th Triplex
29 tooth triplex motor (engine) sprocket that mounts on the crankshaft to drive the primary chain.
This is the engine (motor) sprocket, 29 tooth, in triplex chain form, sitting on the end of the crankshaft where the primary drive picks up power to send back to the clutch and gearbox. It shows up in the crankshaft and connecting rod figures in the parts books, which is where you'd expect to find it since it keys onto the crank itself.
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Being a triplex sprocket, it's cut for a three-row primary chain rather than the duplex (two-row) setup, so before ordering make sure you know which chain type your primary case is running. The catalog shows this one appearing across a run of years, but we'd rather you confirm the primary chain type on your engine than guess from a year alone.
If you're rebuilding the primary side or chasing chain wear, this sprocket is one of the parts worth inspecting for hooked or worn teeth alongside the clutch sprocket and chain itself.
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