SOHC.co.uk Forums > CB350/400
400/4 is popping & banging with poor mpg where to start?
McCabe-Thiele (Ted):
I'm going stir crazy in my head regarding the plug leads is it possible that I have them connected up wrongly firing order wise?
At present the left side coil has two HT outputs I have one connected to number 1 cylinder & the other to number 2 cylinder.
The right hand coil has two HT outlets one is fitted to cylinder 3 the other to cylinder 4.
Is this the right firing order?
When I bought the bike there was only one plug lead lead on each side hanging by a thread - one of the coils was also cracked. Hence why I went for the Dyna S system on the advice of my B-i-L.
If I have the leads fitted correctly then I can eliminate the Dyna S magnetic switching system by re-fitting the original base plate, rotor ponits & condensers. (I will do a compression test first).
The Dyna coils are 3 Ohm is that likely to cause a problem if I return to a CB points based system for the test ?
cbxman:
Ted,
1 and 4 on one coil. 2 and 3 on the other. (CB750). Almost certainly all the fours will be like this.
Jerry
Bryanj:
Yes you have the coils wrong, also 3 ohm coils draw more power which means you can not afford to poodle about as you will need at least 3000 rpm for the bike to charge.
There was no individual link to the us site but quire a few individual reports of failures and i can never post links anyway on my dumfone same as i cant watch videos linked for some reason
K2-K6:
--- Quote from: cbxman on June 18, 2022, 06:41:49 AM ---Ted,
1 and 4 on one coil. 2 and 3 on the other. (CB750). Almost certainly all the fours will be like this.
Jerry
--- End quote ---
Well spotted Jerry, yes you're correct and I think for all the Japanese fours ever made which all do this.
Ted, you'll not be the first as many others have done this over the years too including my local bike shop years ago. They asked me to look with them at a problem bike that they could not sort, they'd done exactly this, :-[ all round.
K2-K6:
--- Quote from: Bryanj on June 18, 2022, 07:13:26 AM ---Yes you have the coils wrong, also 3 ohm coils draw more power which means you can not afford to poodle about as you will need at least 3000 rpm for the bike to charge.
--- End quote ---
Yes definitely Bryan if using 3ohm with points ignition.
With most fully electronic electronic triggering they normally go to fixed dwell time that doesn't over saturate the coils at low speed as I understand them. That aspect taken out, should make them no more demanding than conventional as the "wasted" dwell time won't be there to heat the coil unnecessarily.
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