| Diagram | CRANKSHAFT AND CONNECTING RODS |
| Subsystem | engine bottom |
| Listed in parts books | Not catalogued by year yet |
Rotor, type RM19
Lucas RM19 alternator rotor, part number 34215824, from a 1966 catalog listing.
This is a rotor for a Lucas RM19 alternator, listed in our records under part number 34215824. The catalog shows it appearing once, in a 1966 listing, and it lands under the crankshaft and connecting rods entries in the parts book even though the part itself is electrical, not mechanical.
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The rotor is the piece that spins with the crankshaft inside the alternator, generating the magnetic field that the stator coils turn into current. On these bikes the alternator lives on the end of the crank, which explains why the parts book groups it near the crankshaft section even though it's a Lucas electrical component rather than an engine part in the strict sense.
We don't have more detail on this one beyond what's shown here. If you're trying to match this to your bike, call the shop and we'll confirm fitment before you order.
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