Got a friend's 3400 that they were having trouble with. I pulled the carb, put it through about 15 cycles in the ultrasonic cleaner, replaced the diaphragms and gaskets, set the fuel lever, it was WAY high, put everything back together and it will fire with the choke on, and will start with the choke off, but will die as soon as you pull the trigger. Gaskets and diaphragms are in correctly, and fuel line wasn't pinched, and filter is clean. I had the adjustment needles turned out until they were wobbly, and it made no difference. Any ideas????:bang: