| Also known as | E4141 |
| Diagram | Fig. 1 — CRANKSHAFT AND CONNECTING RODS · ref 19 |
| Subsystem | engine bottom |
| Listed in parts books | 1964–1967 |
Engine sprocket, 26T Duplex ass
26 tooth engine sprocket for duplex primary chain, crankshaft-end drive, catalog PN 70-4141 (also E4141).
This is the engine sprocket, 26 tooth, for duplex primary chain setups, listed in the catalog under CRANKSHAFT AND CONNECTING RODS. It mounts on the end of the crankshaft (or mainshaft, depending on how your parts book labels the assembly) and is the drive-side link that sends power out to the primary chain and on to the clutch.
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The part number 70-4141 shows up across catalog entries from 1964 through 1967, and it also appears under the older E4141 form if you're working from an earlier book. GROUNDING references tie this to the 500 twin family with a 26 tooth count on duplex chain, which lines up with what the catalog calls it.
If you're rebuilding the bottom end or chasing a primary chain that won't stay tensioned, this sprocket is worth checking for wear at the tooth roots and on the bore where it seats. Give us a call if you're not sure this is the right tooth count or chain pitch for what you're running.
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