Ok, I have had my 2002 WR426F for about 3 months. I live in Reno, NV (5500'). The bike has run perfect since the day I bought it. It has no silencer and the throttle stop cut since new. All of a sudden, the bike is bogging big time at full-throttle. The plug is good and the aircleaner is clean. Why would the bike suddenly change? How can I get my bike back to normal? I don't want to spend months experimenting with jetting, I just want it to run smooth and strong again. Where do I start?