I'm at 3700' and it's 80 deg. I went to a 45 slow and 140 main . The fuel screw is at 1 1/2 turns . The bikes alot better than stock. Slow jet is a little fat, but cold weather is coming soon . The bike really felt better ( much smoother starting) . I'd like to know what everyone else is running . The bike really felt and acted lean with the stock 40 slow and 135 main. It seems to pull much harder now. I left the needle in the stock position. The jets are really easy to work on.