Thanks guys I'm getting some good alternative info here, hadn't thought about the gas cap & yet have had this problem on roadrace bikes.
Carb vents. . . erm, heck you know I can't remember. I definitely went through the 200 & did them up & out of the way/airbox. Can't remember if I did the 300 fully.
Re the engine lean surge, well, it would be masked, if you are going up a hill you are under load so you won't get a surge, just a big loss of power then the gas would get so low that it would hardly run. That is what made me think carb, but tank venting is an interesting alternative & why these forums are a good sounding board.
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