Good Morning, I am new to TT and also new to Colorado. I have an 05 WR 450 that I originally purchased in CA. I am try to get my bike jetted properly for the altitude. I have a stock pipe with the little baffle removed and a YZ throttle stop. I have changed the main jet with some success. At 1/2 throttle and up It seems to run fine but it is running rich @1/2 throttle and below. My bike doesn't have different clip positions on the needle. It this a California bike thing?. Do CA bikes have different carbs, slides, etc? Any advise or input on high altitude jetting would be greatly appreciated.