Ok so i'm going to be a good son in law this week while the in laws are down state lol. see all my in laws are ones that think if your sled runs then why clean the carbs. But yet wonder why my sleds are the only ones to idle by there selfs and not pop and backfire. anyways i went over and took my father in laws 93 EXT 550 carb sled and going to do some wrenching on it while they are gone. already tighten a very loose track, replaced a blown out shock that he has had a new on in his garage for 2 years. and starting to clean the carbs. i have one carb off and cleaned already and OMG!!!!!!! not sure how it was running. and all the gas lines need to be replaced also. they are like glass lines they are so old and hard. does anyone know what the air screw on these should be set at? it was at 2 1/2 out and that seems like a lot compared to my polaris specs. i have it set at 1 out at this point. is that right on this sled?