SOHC.co.uk Forums > CB350/400

IDLE PROBLEMS CB400/4

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Erwin83:
Very interesting all this.
I'm having the same problem. Bike won't idle once engine is hot. Warm, it runs beautifully, but HOT.. the idle keeps slowing down and dying. I've tried airscrew settings 2,5 / 2 / 1,75 / 2,25. It's makes a small difference, but it will definately not idle for long.

Plug 'reads' rich with a carbon matt-black color.

If I understand correctly, either the plugs, or the caps should have resistance, right? So not both, and not neither.

I have recently replaced plugs (DR8ES?), caps (VD05F + XD05F), coils and points. Got 4 new NGK plugs on the shelve.
How do I recognize if my caps are with or without resistance, and how to recognize if the plug are with or without resistance (does the R in the type name give it away)?

thanks

Johnwebley:
yes ,the "R" stands for resister,

  if you have a multi meter,you can check the plug caps,

  check your advance,and timing,the plugs should be  cleanish after a run and tickover ,try to lean the tickover even more

Erwin83:
My multimeter has died a while ago and still needs replacing  ::)
The ngk plug caps read 5 kOhm on them.

So i just tried the denso plugs, and the ngk d8ea. Why so fast after oneanother you wonder?
Well, after running idle a while (warming up has always been fine), the engine now starts running on 2 (?) cylinders and dies. Restarting gives a rough 2 cilinder rumble.

On further research, the coils (new ones from wemoto) feel totally different in temperature. One is just warm, the other hot, almost painful to touch...
I have to say, the 2 wemoto coils are a slightly different version between eachother. Think something is up there?

What's this about?  ???

Johnwebley:
you could swap plug leads 1-4 with 2-3,and alter contact breaker cables,see if the trouble migrates,

 I had similar issues with a DSS supplied coils,one failed after less than a year

 if you can borrow a meter check the coil windings  when warm

Erwin83:
So, tried again today and bike started on 2 cylinders right away. No warm up required. Unplugged caps 1 and 4 and found that the new wemoto coil which was installed on the right side didn't function anymore.

I put the original coil back and bike runs fine on all 4 again.

Strange of the wemoto product.. hope they are reasonable with guarantee. Obviously i altered the coil to fit and trimmed the leads...

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