Hey fellow snowester's, need a little help here. Buddy has an 01 Edge X with 375 original miles. He got it from a guy that rode it twice parked it and it sat of 7 years. He cleaned the carbs, filled with fresh gas and fired it off. Had a little pop out he exhaust every few seconds for a little while but first time he rode it it went away and machine ran great all winter. Parked it come spring and this fall went to sell it( his wife and kids decided they don't want to ride anymore so he's gonna buy a Ranger) Fired it off and this poping is back. He brought it over to me because I tinker with sleds and wheelers in my spare time. This popping sounds like backfiring so after I looked at the carbs( nice & clean )I richened up the pilot circut on the carbs and it went away till he came over to pick up the sled( of course) and it started again. Richened it up a bit more but it's still doing it. Once off Idle it runs great, but just sounds bad at idle. So he's worried about trying to sell it with this condition. I'm not sure what else it could be so any help is appreciated.