[cobrajeff]

It's that garbage they sell for gasoline these days with the Ethanol in it. The gas with Ethanol has a lower boiling point than pure gasoline, so in a short "hot soak" the gas with Ethanol boils and percolates out of your carburetors, dripping raw fuel into your cylinders.

The effect can be minimized by using marina gas (it has no Ethanol) mixed with race gas. So far, 90 octane is the hottest marine fuel I can get around here, so I mix that about 75/25 with 108 octane race fuel - seems to help. Didn't have this problem back in Detroit when I could get gasoline that was not watered down with Ethanol.

You might also try opening your hood immediately after a run, and leave it open for awhile while the engine cools down. My next trick will be installing the phenolic spacers I bought for my Webers years ago.

Jeff