SOHC.co.uk Forums > CB500/550

CB500 runs lean and doesn't want to pull through

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RBoss:
I have not changed the fuel line but the tank was very empty, filling it up with the fuel I had left in a jerrycan didn’t help unfortunately. There might also be something else that causes issues, the other day I did a test ride again and the bike just broke down. No electrical power whatsoever; turned out to be a melted wire at the electrical board. I bought a replacement wire harness and will install it soon. Could this have been a problem?

K2-K6:
Yes, the electrics need to be competent to let you judge it running. Ignition is the main draw when running, without having that in good condition you'll not know if it's contributing to the problem.

Old fuel will run (more problem starting it) but won't help you with looking for problems.

A matter of closing out these bits and then having another look to see where you are with it then. It's not far off, but fixing the obvious bits will lead you closer to getting it running well.

deltarider:
Maybe no need to replace the complete wire harness, which may be quite a job. Something I've noticed in your picture; do clean the contacts on top of the solenoid (disconnect battery first). Verify the wiring of your bike is fused at all and... by the proper 15A (and not higher) one. When needed, consult wiring diagram.

Bryanj:
That wire has overheated due to the corrosion(green crap) at thr connector causing resistance which makes heat

RBoss:
So I replaced the wiring harness… and it definitely is a lot better, it doesn’t hold in above 5000rpm anymore so I guess the problem was the faulty wire.
Good comments on cleaning up the contact points as the corroded contacts where not only on the wiring harness side.

Anyway problem solved! Thanks for all the advice everyone!

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