I have an 06 yz450 and i ride in Mexico city, (the ajusco mountains) and we start riding at 9,000ft up to or very close to 12,000. Does anyone have any reccomendations on how to jet the bike? which jet sizes, clip, fuel screw, etc....??? right now the bike has a rich bog at full throttle so i installed a 160 main from 165 and fuel screw at 2 turns, the bike has a lot of torque but no top end, i also have a suzuki rmz250 and it rips compared to this one with stock pilot, 160 main and clip position #2 from top, but when i go there at about 10,500 it starts to bog at 1/4 throttle and then it runs fine, but not as much power, i know altitude has its effects, but at 7000 it runs awesome. So my question is does anyone ride at this kind of height and what settings are you using for the YZ450??? Any help would be greatly appreciated!