SOHC.co.uk Forums > CB500/550
Judge my CB550F2 1977 idling
deltarider:
Do contactbreaker 2+3 connectors accidently make contact to the plate? Check carefully that these forked connectors are well isolated from the plate.
Oddjob:
Check the connectors near the rear brake light switch. You may have disturbed one. Also check the connectors near the coils. Just done a z1000 where 2-3 weren’t firing, it was the coil. Yours however is more likely to be an electrical connection issue.
exvalvesetdabbler:
Pull the plug cap off 2/3, connect up a spare spark plug and lay it on the engine to earth it.
Turn the crank so points 2/3 closed,
Ignition on.
Open close the points with your thumb nail, spark?
Do the same with volt meter across the points, 12v open , 0 volt closed.
Where the wires connect to the points, are the insulators in the right place or have you grounded them to the points base?
Regard
Dave
Oddjob:
He has mentioned that he has a spark on all 4 plugs. You haven’t made the mistake of mixing up the ht leads have you? You wouldn’t be the first tbh. That normally means 2 and 4 don’t work though not 2 and 3. The middle 2 cylinders don’t share a fuel feed so it can’t be that. I wonder if the coil is breaking down under load.
exvalvesetdabbler:
Floats stuck closed? Any fuel in the bowls?
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