I have read with much interest the posts on jetting and looked closely at the jetting information contained in the signatures of riders posting here. There are quite a few variances going on among riders at the same altitude and in the same temperature regions. It is still rather brisk up here in Alaska, with highest temps only in the low 50's for a couple of hours before it begins to drop again. I am at sea level. I completed all the free mods the 2nd day I had the bike. I had changed the main jet from a 150 to a 155(the largest one that came along with the bike). I was still getting alot of popping on decel. The bike was running fairly strong off the bottom and came on hard in the mid-range but would not keep pulling hard on top. Unfortunately, the only area I have been able to ride is on the beach. The sand there is very deep and just not well suited for jetting tuning. After finally getting my back-ordered jets, I installed a 175 main along with a larger 48 pilot. I also went 3 turns out from fully closed on the pilot air screw. I left the needle alone. I was only able to take a short blast through the gears afterwards but felt a tremendous difference in power throughout the rev-range. There was also no popping on decel. Have yet to do a plug reading to see if I went too rich but will get to that when time allows. Seat of the pants feel was very much an improvement . It was very chilly yesterday, wind was blowing damp 38 degree air. Has anyone else went this far up on their main? Any suggestions from the experts would be greatly appreciated?