[Airslot]

Here's a few more thoughts. Wellcraft has in the past put a sock like fuel filter on the bottom of the pickup tube in the tank. You have to remove the pickup to get at it (not difficult) and it can cause a terrible fuel restriction. When you slow down it can clear up a little but when you put the hammer down it can't flow enough for long. Another possibilty. is there a filter where the fuel line enters the carb, most times there is. If it runs good for any amount of time it's probably not the carb so that's some good news. Good luck,

Airslot