1989 Polaris Trail boss 250 2 Stroke Not Starting

Hello Forum,

Im new here to the ATV Forums, I recently purchased a 1989 Polaris Trail boss 250 2 stroke. Did not start when i bought it, figured i would learn a few things and try to get it to start myself. As i messed around with the Carb and put new fuel and oil in and also messed around with the starter i got it to crank, then as i researched more i bought a spark plug for it. The spark plug and the carb made it start but the ATV would start then just slowly die out after a couple seconds. So i figured it was back to the carb.. I took out the carb rebuilt it cleaned it out with spray and everything that was recommended doing and I tried it again it would start and slowly die out as before.

Also a little tip, When i start it up and it slowly dies out i spray more carb cleaner in the carb and then it revs back up again then dies out and i spray more and starts back up.. my guess is the carb but ive been trying to look for a carburetor online that would fit a 1989 polaris trail boss for so far no luck. Would love an feedback on maybe something im missing.

Thank you