Thanks Fern and thanks to everyone else for replies.
I have cleaned the carb, reset the pilot screw using Nigel's method, replaced the fuel line and the spark plug. After each of these the problem still was there - idles fine but backfires at high rpm.
So, I moved onto the stator - I disconnected the cable and retested - problem gone! Then, I reconnected to test again and the problem still seemed to be gone, strange. So, I think it is either a problem with the stator (maybe it is starting to die) or with the connector.
I have a multimeter - is there a simple way to test the stator without inspecting it by draining the oil and opening the case?
I have a kick-start on the bike - do you think I can rely on this for the journey home and just leave the stator disconnected?
Thanks again - I owe you all many
David
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