I bought a cheap 86 bayou 300 for $300, it did not start or run. I cleaned the carb, air filter, changed the oil, replaced the spark plug and new battery and it starts and runs. I was riding for about 30 minutes, and it bogged down and stalled. It wouldn't start again without choke, and would stall when I gave it throttle. I sprayed some carb cleaner in there and it ran again, I got back to my house and it is doing the same thing again.
The gas tank has been kreemed a long time ago, since its kind of bubbly and i can see the metal tank again, I think part of it is getting clogged in the carb, or maybe some rust, there is rust on the top of the tank. But, I put an inline fuel filter on, wouldnt that stop the crap from getting to the carb?
Also, occasionally when the engine is not running and the fuel valve is open, gas leaks out the very bottom of the bowl out of the little nub. I thought the overflow was up top? what is this on the bottom?
Does anyone know where I can get a different carb tat would work for the bayou 300? I hate this vaccuum carb crap. Does one from a different kind of quad work?

Also, will the gas tank off of a newer model fit my 86? I found some on ebay for cheap but the quads are year 2000 +, but no rust.

 

I would take that carb off and take it apart and clean it real good and reasemble it. As for gas tank i have no idea for gas tank fitment. I have a 1996 300 4x4 and love it i bought it and i had to rebuild just about everything on it including the carb. I took my carb apart and just rebuilt it with a rebuild kit and works like a charm.