SOHC.co.uk Forums > CB350/400
400/4 is popping & banging with poor mpg where to start?
McCabe-Thiele (Ted):
--- Quote from: Oddjob on June 17, 2022, 06:29:39 PM ---I'm now wondering if it might be the coils instead now Ted, if they have moulded HT caps then they are not genuine Honda ones, I presume they are something like Dyna coils. I wonder if the primary or secondary circuits are the problem, seems strange it's 2 cylinders acting up and neither are using the same coil.
--- End quote ---
Sorry Ken I probably did not mention it in this post - I have the Dynatek electronic ignition kit with their coils - bought new by me in 2020.
There is a massive spark at No 1 Cylinder when I attach a spare plug to it.
McCabe-Thiele (Ted):
I think I will need to do a compression test just to eliminate a possible head gasket issue.
Bryanj:
The US site keep talking about dyna systems peeing about
McCabe-Thiele (Ted):
--- Quote from: Bryanj on June 17, 2022, 09:49:16 PM ---The US site keep talking about dyna systems peeing about
--- End quote ---
I was recommended the Dyna Kit by my BiL he has fitted them to most of his bikes over the years he rates them. Can you post me a link to the article(s). I've only tested for spark on No1 cylinder using a spare plug on the engine casing. It was a very good spark. I can switch the leads for 1& 2 and see if the problem moves to a different cylinder? I have the option to fit the points again to eliminate the electronic points.
K2-K6:
It does look like that originally fitted plug may be suspect Ted, especially as you've got decent spark with substitute. New set I'd try first to take that out of equation easily.
The carbon corded HT leads I think are fine (I seem to be in a motoring minority on this, but used them for years on cars very successfully) mostly they'd fail from people pulling the lead rather than cap to get them disconnected and fracturing the connection there, but the NGK on wire leads are similarly vulnerable if treated the same way.
Often the crimping goes through the insulation to connect but when the centre is paired back like wire stripping and bent outside the insulation to be fully captured by the crimp they seem very competent in my experience. That's if you need to remake an end connection.
If they are the Dyna leads to their spec I'd encourage the continued use as the resistance can affect switching on these system.
I'll be careful taking about that topic, may attract the attention of the Dutch resistance police ;D careless talk costs sparks an all that :)
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