2002 yamaha wolverine 350 4x4 fuel mixture screw has to be adjusted way out to run right carb is clean and if turned out 2 turns it will pop in exhust and cut off when you stop. Cant turn out enough to make black smoke

If the engine 'pops and farts' quite a bit, it would be that the carb is getting too much fuel, but since you said it did that just a couple times, I would guess it is a plugged line or bad gas or someone has adjusted your fuel mixture screw. You also said that the engine died as soon as you touched the throttle which says it is getting too much fuel. Try taking the gas tank and carb off and see if the fuel flows through it. If you have no issues with that, adjust your mixture screw. You may need to find help on how to adjust the mixture, but you can count how many turns it takes to seat the mixture screw down snug. DO NOT OVERTIGHTEN THE SCREW. Write this number down, you will need it in case you can't get it to crank. Now, turn the screw out 3 full turns and try to crank it several times. If it will not start, turn it 1/2 turn and try again. Continue this until it cranks and then adjust until the engine runs smoothly. It really sounds like you are getting too much fuel. Did you see or smell any gas at the exhaust?