I'm in Michigan so I think the elevation is 6000-7000. 6500 median. Running a drilled .60 and a 30 pilot like 3 1/2 - 4 turns out. Blubbery just a tad on take of and under 10 mph. I switched to this after a .65mm was still four stroking with 27.5 pilot. I don't have a .63mm drill. A 27.5 tends to be under 1 - 1/2 turns out. With this carb without the exaust. Hopefully when I decide.to take the cap off or put the exaust on the 30 pilot will lean out a bit.