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The only thing I can think of is that when filling up you are stirring up possible crap in the tank? If water or other contaminant I would expect it to sputter a bit but then clear itself once the water settled. Otherwise I can't see what opening the fuel cap can possibly do to affect the running. PS: I always start up on the sidestand in neutral but again that shouldn't a prob one way or the other.When I had my bike serviced last month the head sensor was changed, the old variety (thin brass?) had a habit of breaking so Norton are fitting a stronger unit made from stainless, sorry don't have the part number.
The only thing I can think of is that when filling up you are stirring up possible crap in the tank? If water or other contaminant I would expect it to sputter a bit but then clear itself once the water settled. Otherwise I can't see what opening the fuel cap can possibly do to affect the running. PS: I always start up on the sidestand in neutral but again that shouldn't a prob one way or the other.
When I had my bike serviced last month the head sensor was changed, the old variety (thin brass?) had a habit of breaking so Norton are fitting a stronger unit made from stainless, sorry don't have the part number.