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.