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Sorry, I didn't read your original post carefully enough. I see you already had the problem, and you replaced the carburettor in an attempt to fix this problem.That doesn't necessarily mean that the carb is set up properly, but since the symptoms did not improve or change, I think we need to look elsewhere. It seems like a 270 main is plenty large enough, if not too large. I think that I am running a 260 in the single Mikuni on my Commando. The larger the number, the "richer"the jet.
I was going to suggest that you check the float level. Low fuel level in the float bowl will cause lean running at high rpm.When you depress the tickler, does fuel come out within a couple of seconds, or does it take several seconds. If the latter,your float is set too low.
You have checked fuel flow to the carb from the tank? Filters,petcocks, lines,and vent all clear?
Does it do it any time you are at full throttle, even at lower rpm, or just at high rpm? In any gear, or just high gear?
What color are the plugs? Are you getting a fat blue spark at the plugs?
Don't worry, we'll figure it out!
:chug:
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