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Neils 1978 CB550 F2 Project - Newbie Let Loose

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Oddjob:
I seem to recall there is a small pin on the back of the button, a small spring goes over this, which makes the button return. Can you feel this in operation, the spring normally rusts through after some years and the button tends to just flop around. The pin on the button goes through a small hole on an internal plate with the spring pushing against this plate for its resistance. As you press the button the pin goes further through and connects with the contact on the other wire, this activates the starter solenoid. However your switch is so dirty and full of crap I doubt this was happening. Unless the internal plates are broken or missing it should be a simple fix.

Neilw:

--- Quote from: Oddjob on January 30, 2026, 06:56:39 PM ---I seem to recall there is a small pin on the back of the button, a small spring goes over this, which makes the button return. Can you feel this in operation, the spring normally rusts through after some years and the button tends to just flop around. The pin on the button goes through a small hole on an internal plate with the spring pushing against this plate for its resistance. As you press the button the pin goes further through and connects with the contact on the other wire, this activates the starter solenoid. However your switch is so dirty and full of crap I doubt this was happening. Unless the internal plates are broken or missing it should be a simple fix.

--- End quote ---

It's exactly as you've described. The spring appears to be broken, and I managed to break the connection to the white piece of plastic. Assuming I can solder the broken wire and replace the spring, I have no idea how to reassemble, as the spring needs to be fully compressed so  the other two parts can be slotted in for it all to work, and you can't get tools or fingers in there to do it.

Bryanj:
You need the optionaly japanes spider with mechanical degree OR a lot of luck!

I have spent literaly hours trying to repair one and very, very ocasionaly only 10 mins.

The least frustrating way, but not the cheapest is a new switch

Just for a sxreenshot from CMSNL

Bryanj:
Also this ebay one BUT the wire colours are different

Sorry forgot to attach, done now

Oddjob:
I’m saying this without trying to promise anything. I’ve been extremely unwell recently and am still unable to do a lot of things I used to be able to do. I do tend to collect broken switchgear and have built up a supply of some of the internal parts, I may have just what you want or I may not. The problem is looking for them, that may be beyond me at present depending on where I decided to store them. Post some pics up of what you think is broken and I’ll see if I can help out.

I personally find fixing these switches easy, not sure why, perhaps I can good fingers (although not at present). If you’re unable to fix it I may be able to have a crack at it, I think I can manage little jobs like that.

Give the switch housing a good wash out with petrol or similar, see what we are facing, really grotty in there.

I’d say someone had bodged the harness up somewhat badly.

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