I once had a Duc that used to do that. Turns out that the tank was oddly shaped and the pickup for the fuel pump was an inch or so above the bottom of the little sump that the tank formed. As condensation accumulated, the water would eventually get up to the level of the pickup. The bike would start and quit, start and quit, start and....well, you get the idea.
Stabil and other ethanol-based additives can only absorb a small amount of water; large amounts require cleaning......
When I emptied the tank there was about 2 cups of water and a lot of dead bugs in the mess....I needed to replace the in-tank filter as well, as the amount of water had caused the filter element to swell.......
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