I read somewhere on here that a feller drilled small holes in the air box lid and used rubber grommets to plug them. When he would get in higher elevation he would start pulling out the plugs. I dont know what size jett to start with? Maybe around a 124-125 and go from there. If i was gonna be in the mountains all the time at higher elevation and wasnt concerned about running 60mph i would try around 55-57 rear sprocket. My bike ran ok up to around 9-10,000' before it started studdering but im sure it was still a bit rich at thoses altitudes but it made it the top of imogene pass which was all i was asking for with the stock jetting and 14/47 sprockets. Not ideal but we made it. Are you down around silverton, ouray, telluride area?