I just installed a GYT-R midpipe and silencer with GYT-R filter,outerwear. My elevation is 1,200 ft..I do ride the mountains in the summer at elevations of 2,500 to 7,000.I Changed the jetting from stock 142.5 to 160 main,pilot stock,air screw 3 turns out,needle on 3rd position bottom. This is instuctions from dealer, he says I might be a little lean down low,GYT-R says 155.Question is if I ride at a higher elevation should I rejet.Any replies would be helpful maybe ease the mind a bit. Thanks

 

yeah you have to lower the jetting
the air is thinner
up to 3000 is the first bracket
you can get away with just playing with the screw to get it right
after 3k, you need to drop the main down 1-2
depending on how high
the temp

my buddy on aim told me that..