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You're right in that it isn't guaranteed to be any one thing.
But, one of the things I did when I got the bike was clean out the carburetor. When I put it together the first time, I wasn't careful enough, and the float bowl cutoff plunger fell off into the bottom of the bowl.
Let me tell you: There is no way in hell that the a properly working fuel pump can't keep up with WoT on one of these bikes. The pressure-washer-like stream of gas coming out of the overflow tube would easily drain the 2gallon fuel tank in less than ten minutes.
What can cause it to gasp for gas, is a vacuum loss. The wider the throttle is open, the less vacuum is available to drive the pump. If you already have a leak in your system, opening up the throttle could well cause the vacuum at the pump to drop below proper operation.
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