Hi Dave
Long shot but I've had bad experiences with low octane fuel causing 'wiskers' across
plug electrodes. These are carbon build ups and they play havoc with your plugs
firing. Symptoms are you're running fine then miss fire starts and increases, you stop
and bike starts OK after a while as the plug has cooled down and the firing up of the engine blows the wisker off the electrodes. Off you go again and the process repeats.
I found that a long coast with closed throttle then just as the bike is at a standstill
open the throttle and maybe the whisker blows off.
Permanent cure is difficult whilst all you can get is rubbish petrol.
Maybe try opening the plug gaps see what happens - easy to do and worth trying..
Good luck..
Neil
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