SOHC.co.uk Forums > CB350/400

Odd spark problem

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Northy:
I've  think I sorted it .......but its a weird one (Northy what hell are you talking about !!  ::) ::) )

Well for few weeks I've had this problem with the special 400/4 . After about 8/10 miles it would lose number 2/3  cylinders with no spark.The more you used the revs the less miles you did, so heat related? however wait 5 minutes and it runs Ok on all four, for about 4-6 miles.
This was PIA as it fixed it self before you got to testing things.   >:(

But Coil I hear you say ! ::) ::)

So replaced the new DS one with an old one ..same result
Replace both coils and leads/cap from my other 400f ...same result
Swapped plugs ...same result 
Replaced the condensers from my other  400f, clean points (again) ...same result
Checking wiring/connecting ...all seem ok
Not water related as only used in the dry
Thinking of making up a new wires from the points to coil or pleading for help on the SOHC forum  ;D ;D

Then today I had a thought (yes the 2 brain cells clicked in) this followed yet another run of 10 miles, then it goes onto 2. What haven't I changed and what have I changed. As the other 400/f with the swapped out part runs fine.

Well it took 1 minutes to fix it ......I managed 22 miles with not even a misfire , lots of revs etc (by which time it was getting colder )

The possible culprit .....

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I don't know why but replacing this with the standard chrome points cover sorted it. I had fitted it a few months back. 

Its not clearance issue but the ally one does get a lot warmer then the chrome one .This could point to something (points/condenser) breaking down under heat. The final test is refit the ally one and see if I can make 22 miles. (way too cold now for that )

So I think its sorted but its an odd one .....anyone had issues like this ? 



 
 
 
   




 

 

K2-K6:
Doesn't the original have a coating on the inside of cover?

Got a photograph of of the inside of both covers to look at?

SteveW:
Mine has some kind of greyish coating on the inside of the cover.

Nurse Julie:
Yes, mine does as well. It's defo some insulation of some type.

Northy:
Yes there's  a grey coating on the inside of the original cover .Original I thought this was just is grey paint to save on chrome.
Appears Honda knew something !!!

So will add some insulation tape to inside of the ally and take it for spin ........and report back.   


 

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