2000 DRZ400Y (kicker model) bought new Basically an E model.. Full Yosh pipe , running the Medium insert ... stock engine. Don't recall what jetting , its been sooo long since I set it up I haven't touched it in years. Aftermarket fuel mixture screw .... It has run good for all these years .. I have only had to change a valve shim twice in 11 years..... Now I'm noticing a surging or hesitation at low steady throttle. Last week at the Big Bear Run it felt like the brake was dragging. It seems like it ran a little hot too . I had to shift more and keep it up in the revs. Mind you. I ride up there allot so I can tell the difference between altitude and just not running right.. I don't even remember how to adjust the carb its been so long. Could it be that simple as adjusting the carb? After all this time could it come out of adjustment? Could it be silencer packing? Or valve adjustment? Or junk in the carb? Is it weird or normal?