| Also known as | E3734 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 17 |
| Subsystem | engine bottom |
| Listed in parts books | 1968–1970, 1974 |
Engine sprocket, 26T Duplex.
Engine crankshaft sprocket, 26 tooth duplex, part number 70-3734 (also E3734).
This is the engine sprocket that drives the primary chain off the crankshaft, a 26 tooth duplex-pattern sprocket carrying the number 70-3734, also found under the older E3734 designation in earlier parts books. It sits on the end of the crankshaft in the primary chaincase, transferring power from the engine to the clutch and gearbox via the duplex primary chain.
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This sprocket shows up in the crankshaft and connecting rod section of the parts books, which tells you it's tied directly to the crank rather than a separate shaft assembly. Catalog listings for this part number span 1968 through 1974, so it saw use across several seasons of production.
If you're replacing this sprocket, check tooth wear and chain fit carefully, and confirm it matches the duplex chain and clutch sprocket already on your engine before ordering, since sprocket pairs need to work together.
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