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[samj]

Dennis I did as you suggested and gave it the heat treatment,spark just as good when hot. Checked my records -replacement armature fitted by Dave Lindsley(nice chap) in 2010 when I got the bike. Whether this included a new condenser or not I don't know but I'm sure he would have tested it before and after fitting. I was very impressed with his workmanship. I THINK I may have found the problem but until I've proved it I'm saying nothing! Will get back.

[Dennis C]

Hi Sam, If Dave did it it would have a new modern condensor which are far more reliable than the old ones. Please let us know the outcome, I was now trying to imply that the mag was the fault just advising on testing, I hope it was some help to you.

[Dennis C]

"I was now trying to imply that the mag was the fault just advising on testing". For now read not.

Please can we have an edit facility.

[simon]

Tell me, is it still a bit brisk over there? I occurs to me that you might be icing up the carb. That stops a motor pretty dead and then goes again as soon as the bike is stopped and the endothermic process of vaporising fuel is stopped for a bit. Just a thought.

[samj]

I think I have now found the cause of the problem-and Alan R wins the prize. I removed the fuel line plus filter,replaced by pipe-no filter. Given several road tests of differing lengths,no sign of the fault. Replaced fuel line plus filter,failed on first run. This time I carefully observed filter,it was only half full even though there was plenty of fuel in the tank. Depressing tickler on float chamber had no effect,stayed half full presumably air-locked. I suppose I should have waited to see if level eventually rose but opted to slacken off the floatchamber union whereupon filter filled up ,bike started end of problem. I examined the filter,which had been in use for several thousand miles, and can find nothing wrong with it. Same `blowing' resistance as an identical new one,no obstructions in pipe,filter paper not blocked up,fuel pipe used is modern type. So there you have it-perhaps the answer is to change the filter on a regular basis. My sincere thanks to all of you who responded.