I keep seeing conflicting opinions on 1) whether I need to do this at all, and 2), whether it is something that is feasible for a normal, non-techie person like myself to take on. ( I do my own oil changes, fluid changes in transaxles, brake jobs, etc. but not carburators). Bought my Griz new in 2006 and it has about 1280 miles on it. Has always run great and still does. Pure stock except for replacement tires. I recently moved from New York Sate (elevation 900 feet) to Colorado and now ride at about 8500 feet. Both my Grizzly and my 2006 Kawasaki Prairie 360 seem to start and run just fine at this altitude. The only differences I notice is that the exhaust "smells" a little richer, and the top end is not quite what it was at sea level. The local dealer told me I probably could just adjust the screw on the carb and that would make it better, but he does not work on Yamahas and said the carb is so hard to get to it may not be worth the trouble. Am I risking doing damage to my Griz by riding it like it is? Someone else told me the only bad thing I'm doing is burning more fuel than necessary because the engine is running rich. So what's the real deal on this issue? I could probably take it to a Yamaha dealer which would be a few hours away, but I'll attempt it myself if you guys say it's possible for a DIY project. Thanks in advance.