I ride between 2500-6000ft, and have had my 03 650 Prairie rejetted one size leaner (according to the Kawi jet specks, forget what the numbers are right now) It runs well at about 3000ft. Does anyone know how I should jet with new snorkle, new filter and NYROC muffler mod. I'm guessin' back to factory jets would rich it up enough to take care of altitude. One size larger jet a sea level would mean one size smaller at 3000ft. Or is it a case of trial and error? Thanks in advance.

 

i would leave it as it is , being at 300ft like i am should not be a problem even with the extra air the snorkle ,muffler mod and filter gives you. i tried smaller jets but they rob the power, went back to the factory jets. i have original filter , dayco hose to air box, and a modified muffler with 1 5/8"opening. no problem.