I've got a 2004 Polaris 90 I got cheap and am trying to rehabilitate for my kids. When I first got it, it would only run with the choke on. I pulled the spark plug which was black but in surprisingly good shape. The air filter was also in pretty good shape. Pulled the carb and it looks brand new. Cleaned it out anyway, made sure the jets were clear, etc., Put on a new fuel line between the petcock and tank, and the gas seems to flow freely.
Put everything back together, kicked it over, and it started right up without the choke on. Started to give it gas and it died immediately. Started it again and it idled ok, but died when I tried to give it gas.
Adjusted the air screw (so many times I forget which setting I was on) and got it to where the engine would idle, and I could apply gas and take off. Under heavy throttle it was bogging down (too lean or too rich I can't tell), but when I brought it back to idle it would die.
Tried adjusting the throttle slide stop screw and nothing really happened, except once or twice when a slight adjustment coincided with the engine dying.
Starting to chase my tail here. I'd really appreciate any insight as would my kids!