SOHC.co.uk Forums > CB350/400

Electrical Failure

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Velofello:
I can start my 400/4 up on the button ,but after about 3 to 5 mins it stops with total electrical failure. No lights, no neutral lights no horn. Leave it for about 5 mins hey presto it starts on the button. If I ride off it will fail again whereupon I wait at the side of the road for electricity to return and off I go . Not a very good way to travel !
Battery is in good condition . I have checked the obvious eg earthing, battery connections and wiring damage but nothing immediately obvious.
Any suggestions(polite!) as to where to look/ check next

SteveD CB500K0:
Total electrical failure means some sort of disconnection (like a blown fuse).

You say that it comes back on - is this after the bike has cooled down a bit?

My guess would be some sort of high temperature failure with the fuse or fuse holder that "re-connects" when cool.

Ash will know...  :)

Steve

Velofello:
Thanks for the response. Yes the symptoms are as described. The bike starts after it has cooled down. I don't even get any life from the starter button when it fails.
I was thinking high temp failure but of what ? Your suggestion of fuse or holder seems to make sense as I have had problems with a previous 400/4 failing in this area, though not in the same manner as my current one. That was yellow too !

SteveD CB500K0:

--- Quote from: Velofello on August 10, 2017, 04:54:02 PM ---That was yellow too !

--- End quote ---

There's your problem then - get it repainted a different colour!

Seriously, it could be a fractured solder joint that just expands with heat.

hairygit:
I have had a few bikes have that issue over the years, 750F1 & 2, 400 fours, 550F1 & 2, and a Cb650. There was a common problem with them all, the ignition switch. On some, the switch needed taking apart and a loose rivet that held the terminal pins in place peened over with a hammer to make them tight again, on others the plastic switch part had come loose/ become dislodged from the metal lock body causing your symptoms intermittently. Often the plug on the loom to the ignition switch will show signs of heat damage, as poor connections increase resistance, which produces heat.

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