Anybody have spot on jetting for a WR426 running in Colorado? I ride from 4k (Moab) to 5k(Denver) to 7k(Rampart Range) to 12k(Crested Butte). Have dropped to a 150 main, but think that's too lean. Dealer left in a 160, which foulded like crazy. Read from others that a 150 works for them. Also read others are changing PJ's with better success than leaning out the main. Dealers don't have much to offer around here... I have a 2001 WR426 w/ YZ timing and silencer core removed. A buddy has a stock WR426, so any additional advice would be appreciated.