Alright, I am new here because I just recently got an 06 yfz. I wanted to wake it up because it doesn't quite hit the spot like my 450 bikes would. I haven't tinkered with 4 strokes much so I'm kinda new to them (mechanically). I did the zip tie mod and started riding and noticed it popped a lot and shot flames out the exhaust so I did research and got a GYTR jet kit. It had a 45p 165m and #3 (on GYTR needle) and I lost count on the fuel screw. I took it up to a 168p #4 on GYTR needle and 2 turns out (like jetting sticky suggests to start). I also threw on a GYTR hi flow filter (similar to k&n) with the adapter plate and pre filter and took air box lid off. It also had the GYTR pipe when I got it. It still pops and shoots blue flames about 2-3 feet out but it only happens when I hit the gas after I have let off. Does it at all rpms. Could someone point me in the right direction? I ride between 400-500' elevation.