I got a 2003 pro x 600 for very cheap.. in decent condition with just under 2800miles has good compression, spark, and seems to have fuel as the spark plugs are wet when you pull them out... is getting air aswell it seems.. it will run for a bit when you pour gas down the cylinders but then die out, will respond to throttle but will die out at about the same time no matter what you give it for gas. I was able to start the sled before without cleaning the carb and it did idle.still haven’t cleaned the carb and was thinking it would start again without a cleaning yet. Was wondering maybe if it had sucked something in while I had started it before? Not sure. Looked in cylinders and in carbs doesn’t seem to have anything too alarming. The sled did backfire once while it started for a short time. Maybe just cleaning the carb first would be my best bet? Thanks.