I am working on a 1987 Honda foreman fortrax 350. This four wheeler has a mind of its own! At first it would not start, found rust in fuel tank,cleaned tank.Replaced fuel pump, not running. replaced fuel filter, stopped up with rust.Rebuilt carb.with new kit. Runs great one time and then cant get started at times, just pops like trying to hit but wont run…. Had air duct off back of carb. and when wont start blows gas and air out back of carb. Can someone please help me!!!! Thank you for any help!!!! I am a Auto technician and not stupid but relly feel flustrated.