I have a 1996 Polaris 350L trailboss. I bought recently as my first utility quad and it ran decent and I could ride it the first 2 days. Well I let my brother ride it and it broke down and wouldn’t start. I pulled the plug it has spark (blue) and compression from what I could feel. I took apart carbs cleaned them and it still won’t start. I held my hand over the carb (where air box connects) and it didn’t even try to suck my hand in. When I spray gas inside carb it will start and just rev and die. Not sure what it is please help!