Embarrasingly I had to call out the AA to a drizzly M3 hard shoulder when I was delivering my '89 Dommie back home. One of the wires in the suppressor circuit just above the coil was grounding against the frame intermittently, causing misfiring and dying.
I went through all of the stuff discussed by the road - earthing nr battery, carb jets blocked, you name it. Eventually the AA man twigged that he could force it to cut by turning the bars, which pulled the wire and touched it on the frame. Frustrating. Perhaps you have a problem like this?
...unless there really is some obviouslyt mechanical noise going on... PS > I think when the bike is running you can (carefully!) take off the oil tank cap and shine a torch down - you should be able to see healthy oil flow from the returnn pipe. Might put your mind at rest about faulty oil scavenger pump.
Keep us posted, eh?
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