Ok, here is another update for jetting at 800 ft MJ: 152 PJ: 38 A/S: 1.75-2 turn out. Needle: JD Red at 4 clip Air temp is from 70 to 85 F. this is JD's 0-4000 ft suggestion and seems to be spot on. Nice job My daughter rides a 2015 xtrainer and complained about the burble on the bottom end, it would kind of sputter/burble and then take off a bit above 1/8th throttle. Very irritating at slow speeds in rocks. The JD kit fixed it but I have to say it probably was not due to the needle as the needle should not have any affect until more throttle. The PJ was a 35 and JD says to use their 38PJ which i suspect is what fixed it. I have used many JD kits and am a big fan. I will also say there is more topend now and does wheelies much easier so the needle does help. I had tried both the needle that came on the bike and the one they give you. So in the end I suggest you just get the JD kit. Hey I installed that exact same jetting today! Stock was pretty good but I've always had great luck with JD so thought I'd try it this weekend.