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Discussion Starter · #1 ·
Just purchased a 1981 CM400a. Bike appears to be in fairly good condition with the main issue being it running rich and a the headlight sometimes working. To give more detail is it just sometimes turns on and works fine and other times it doesnt, my first guess would be a bad ground but im not sure about the wiring on bikes.
 

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Choices are the fuse, switch, connectors, bulb or ground. Testing will reveal which one. You need the FSM and a color wiring diagram will also help. PM sent
 

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Discussion Starter · #4 ·
Thank you! Will check the fuses tomorrow since those are simplest and I have a few spare, After that I think grounds are next go to, Illinois brings rust so it's fairly likely
 

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Discussion Starter · #5 ·
So we traced it to the right hand starter switch. Any idea if i just need to re solder the wires or if i have to get a whole new switch?
 

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Depends if a wire is loose or just hanging on in there, how bad are the slide contacts etc.?

Can't quite remember but have fun with the little ball and spring ?!
 

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Discussion Starter · #7 ·
Depends if a wire is loose or just hanging on in there, how bad are the slide contacts etc.?

Can't quite remember but have fun with the little ball and spring ?!
It looks like everythings in there ? What?
 

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You can disassembly and clean. Fix anything that looks questionable and should be good. Besides that, it depends on the condition of the wiring on the bike. I rewired my whole bike because I started having light issues and would fix it and another problem would spring up a few weeks later. Started to get unreliable after awhile and I was worried I'd get stuck somewhere one day. When I did the new wiring I found a few bad grounds, cracked wires, and several questionable connections. If yours is like this then I would consider replacing with new wiring. Perhaps you'll be able to get leds which draw less power from the system.
 

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2 Philips head type screws from the bottom. I say "type screws" because while they look like Philips they're actually JIS. Likely the screws are pretty well stuck in place so use an impact driver to break them loose.
 
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