my 1984 atc110 runs great, starts first pull without even giving it gas if i put the choke in the sweet spot. it runs perfect. but when its running low on gas it wont idle very long. it runs fine when riding it but when i come to a stop it will idle maybe 5-10 seconds then die. the gas level is well over the bottom of the gastank drain hole. once i refill the tank it runs perfect again. its only when the middle of the tank is completely exposed. its almost like the gastank needs the weight of all the gas for it to flow properly, but it runs fine when its on the throttle...
i plan on doing a fix up on the tank soon and im not to worried. im just wondering what your ideas might be. its weird