i have a 95 fourtrax 300, its been sitting up for a while. i got quad out, changed oil, drained fuel tank, and it will crank and run fine but when choke is turned all the way off the engine shuts off. theres a fine spot the choke can stay at and it will run at somewhat normal idle. removed carb dis assembled and cleaned and still have same problem. its just like ur cutting the kill switch when it happens.