SOHC.co.uk Forums > CB350/400

Failing coil

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Bryanj:
Reason i asked is that on the us site there have been reports of someDyna units failing, and thats the originals not the knock offs.
You say the coils are 5 years old again genuine or pattern, either way have you checked the resistances against the manual, in all hoesty i dont think ive ever seen a failed coil, leads yes and from Honda that means a new coil but not the actual coil

scottly:

--- Quote from: Athame57 on Today at 10:59:06 AM ---I lifted the tank, cleaned a few things up and as I had them handy changed all plugs. All was well again after a brief ride. Today I start up nicely but within about twenty seconds things went bumpy with uneven firing and I was mostly back to two pistons

--- End quote ---
What did the spark plugs look like? Since replacing them corrected the issue for a short while, perhaps they were fouled by carbon or excess fuel.

Athame57:

--- Quote from: scottly on Today at 07:20:00 PM ---What did the spark plugs look like? Since replacing them corrected the issue for a short while, perhaps they were fouled by carbon or excess fuel.

--- End quote ---

Very sooty  :(

scottly:
Sooty means you have a carburetor problem: too much fuel or too little air. It takes a spark to light the fire to make soot. It ran for a while with the new plugs until they also fouled. Be aware that once fouled, the plugs will stay fouled even after the cause has been corrected. To clean fouled plugs, I burn the black off with a propane torch.

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