Norton Commando Wiring Diagram + cNw Electric Start Conversion
The cNw kit, found here is actually very reasonably priced at $2,495 if you consider that it includes a belt drive primary.
As always with Colorado Norton Works, the quality of the fit and finish is second to none.
If you don’t want a highly polished finish, there are option for satin and matt black too.
Matt supplies a starter button with his kit, as the quality of the original switches were dubious when they were new. That makes it difficult for Matt to support, and guarantee the reliability, hence shipping his own.
However, of the people I have spoken to, most want to use the original handlebar switch gear, and make use of the ‘spare’ button that Norton themselves never got round to using (the MK3 used different handlebar switches)
The 1971 and 1972 onwards diagrams use the original Lucas switch gear.
The 20M3 bike is not a good candidate for an electric start conversion, as the points location does not give ample clearance for the starter motor assembly to be mounted.
If you want to fit electric start to an older bike, either fit a later camshaft and timing cover so that you can move your ignition to the front of the bike, look into a crankshaft mounted ignition trigger, or fit a later engine.
Anything is possible of course, but i would suggest that the engineering work/re-work involved would make it non-viable for most, and probably not financially sensible either.
Pre-1971 (ammeter in the headlight shell and Wipac Tricon type handlebar switch) PNG 3066×1841
1971 (three wires to the master switch) PNG 3066×1841
1972 onwards (four wires to the master switch) PNG 3066×1841
I will post a diagram that includes Tri-Spark electronic ignition and Podtronics reg/rec too.