i have a polaris 2002 250 trailblazer. it was built about nine years ago. shaved head, port and polish, bored and piped. i had it professionally tuned. it sat for about 9 years once a year maybe getting fired up. the thing wont start unless its full choke. then when i half choke it idles. doesn't matter if its warm, still needs the full choke to start. then when i take off the choke. it revs up really high and shuts itself off. i have cleaned every nook and cranny of this thing. i never played with the adjustments from the tune. but I'm getting no luck so i have played with the air fuel mixture and the idle and cant seem to get close to anything. please help. someone had to have had this problem.