hi i have a honda trx 300 4 stroke quad with a carb. problem it starts up in choke, runs in choke,then i will take and shut the choke off after it is warmed up and it stalls.can anybody help me on this problem? thank you john

Usually it is caused by a fuel obstruction, you may have debris in your pilot or main jet. I would take off carb. and clean. Also check the fuel flow from the shutoff valve to the carb.. Also check for debris in the fuel tank.
I have a Fourtrax 250 that had the same problem. The owner had put on a plastic fuel tank because of the rust from the metal tank. The rust got into the carb., I cleaned the carb. and it runs great.

thank u mikel i will try this and get back to you

I have a 300 ex myself, give the carburetor a good clean and check the diaphragm for damage. Also there is a fuel screen in the fuel shut off which acts as a fuel filter, you might want to clean that as well.

hi i have a honda trx 300 4 stroke quad with a carb. problem it starts up in choke, runs in choke,then i will take and shut the choke off after it is warmed up and it stalls.i also cleaned the fuel tank fuel screen and took the carb. off and cleaned that as well.can anybody help me on this problem? thank you john

http://forums.atvrideronline.com/70/7478529/atv-riding/carburetor-cleaning-101-its-that-time-again-sticky/index.html

http://forums.atvrideronline.com/70/7566251/atv-repair-maintenance/finally-jetting-101/index.html

You can also post your ? there.