I took my new-to-me 95 GS out for its maiden voyage, and I think I may have a carb jetting issue. The bike came from Denver (mile high), and I live in Oregon (162ft). I was thinking maybe old gas, but it was from November...a while ago...but not THAT long. The symptom is the bike stutters badly when I twist the throttle more than about 1/2 turn at @ 3300 rpm or above. It starts fine, idles fine. I asked the previous owner if the bike had been rejetted for his altitude, and he hadn't had any carb work done. It ran fine for him. It only has 34k miles on it. Maybe a dumb question, but do CV carbs need rejetting for altitude changes? Or should I be looking at some other cause?