SOHC.co.uk Forums > CB500/550
Trouble with bike
K2-K6:
Thought to add, for wiring "diagram " :) looking at the #1:4 points on the ignition plate, note the colour of the wire going out of there into the loom, then go up to the coils, same colour wire is the coil for 1&4 plugs, which are the outer most cylinder locations on the engine.
The other coil, obviously going to the middle two cylinder pair.
It doesn't matter which HT lead from one coil goes were, as long as they are identified as above advice. In other words you can swap 1 with 4 as long as they reach, or 2 with 3 ...... but not otherwise.
McCabe-Thiele (Ted):
I think this bike has Electronic Ignition reading earlier posts.
beardylondon:
That’s right Ted, electronic ignition.
--- Quote from: McCabe-Thiele (Ted) on March 19, 2025, 09:35:51 AM ---I think this bike has Electronic Ignition reading earlier posts.
--- End quote ---
K2-K6:
Coil arrangement still the same though.
One coil supplies two HT and will only spark correctly eg 1&4 as paired, with the other coil for 2&3.
If you've anything other than the above combination on HT then it won't run all the cylinders correctly.
In this case that number one cylinder seems correct, the other HT from that coil MUST go to number four cylinder.
That will just leave the other coil to supply the 2&3 cylinders in the middle of the engine.
McCabe-Thiele (Ted):
I can't see having electronic ignition being involved, as has been said if it's firing on number 1 cylinder then that coil at the other end of the HT lead should also be supplying number 4 cylinder. I believe on production the coil on the left side of the frame supplied cylinders 1 & 4. The corresponding LT wire would be Blue for the left coil.
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