SOHC.co.uk Forums > CB500/550
Failing condensers
hubster123:
--- Quote from: Johnwebley on July 08, 2020, 10:50:47 AM ---It could also be using R plugs and resistance plug caps.
Have you checked the caps to make sure they are not "burnt ".
They should measure 5k ohms.
Unlikely all the capacitors are faulty.
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--- End quote ---
Right....thanks.... Unfortunately I don’t really know what that means.. I can say though that I took the coils to my motorcycle mechanic in January and he checked them with a meter (all the readings were correct) and as per his recommendation, I changed the plug caps (NGK)..
I know where you’re coming from re it being unlikely that all the condensers are faulty, but when I put a new one on, the bike runs fine and if I swap the ‘faulty’ one (from 1 and 4) with the one that runs cylinders 2 and 3, then 2 and 3 won’t fire.
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Johnwebley:
--- Quote from: hubster123 on July 08, 2020, 12:38:27 PM ---
--- Quote from: Johnwebley on July 08, 2020, 10:50:47 AM ---It could also be using R plugs and resistance plug caps.
Have you checked the caps to make sure they are not "burnt ".
They should measure 5k ohms.
Unlikely all the capacitors are faulty.
Sent from my SM-A750FN using Tapatalk
--- End quote ---
Right....thanks.... Unfortunately I don’t really know what that means.. I can say though that I took the coils to my motorcycle mechanic in January and he checked them with a meter (all the readings were correct) and as per his recommendation, I changed the plug caps (NGK)..
I know where you’re coming from re it being unlikely that all the condensers are faulty, but when I put a new one on, the bike runs fine and if I swap the ‘faulty’ one (from 1 and 4) with the one that runs cylinders 2 and 3, then 2 and 3 won’t fire.
Sent from my iPhone using Tapatalk
--- End quote ---
The resistance in the plug cap burns out over time.
Massively increasing the resistance caused ignition problems.
If you have access to a multi meter you can check they are still 5.000 ohms
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taysidedragon:
Did the problem start just after changing the plug caps?
They could be faulty or fakes, or not making a good connection with HT leads.
As John said, resisted caps and resisted plugs used together don't run properly.
hubster123:
--- Quote from: taysidedragon on July 08, 2020, 01:25:42 PM ---Did the problem start just after changing the plug caps?
They could be faulty or fakes, or not making a good connection with HT leads.
As John said, resisted caps and resisted plugs used together don't run properly.
--- End quote ---
No.... it was there beforehand.. What is strange is that if cylinders 1 and 4 stop working and I swap the condensers round, 1 and 4 work and 2 and 3 don’t.
Could faulty plug caps cause this issue?
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Bryanj:
This one is a strange one, need to try and figure out what is the difference between the 2 ignition systems. I know its a pain but swopping the coil wiring and seing if the same condenser fails might be worth it.
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