Chuck Piazza

Is this air/fuel adjustment fairly easy to perform as long as I find the correct screw?   

Hello,

                I have a 2005 Yamaha Bruin 350 atv,  I live in Pennsylvania and  planned on using it in Colorado in a few weeks.  I'm being told by people that I may run into some issues at the higher altitudes ( 6500 to 9000 feet ) since the atv has a carburetor.  Can someone provide some insight?  Thanks.