I recently purchased a Polaris Xplorer that doesn’t run. The previous owner parked it Because the shifter was jammed and he thought it needed a new trans. I got it un jammed but it will not start. I brought it home and pulled the carb and plug out of it first thing without trying to start it. Got the carb clean and put a new plug in. New gas the whole nine yards. The engine has great compression. I got it to run for 10 maybe 15 seconds and it died. Pulled the carb back off and cleaned it again threw it back in and it will not start it. It backfires through the carb and sometimes out the exhaust. What am I missing here?