Hey guys and gals. I'm new here. I bought a brand new 2002 off of eBay last year. The bike only has about 30hrs on it now. I've never been able to tune the carb right. It's a Canada model so the carb is a little different jetted but not much. I'm trying to find someone who knows how to jet them for high altitude. I dropped the main from 162(stock) to 152, and I've played with the needle (up and down) no luck. It's VERY choppy on the bottom end. So bad I can't ride it normal. I've also set the floats to what I think is correct. I've also turned the air/fuel screw, no good luck either. I had a 2000 426 and it was tuned my Bruce Sass, Vickery Motorsports in Denver and it ran like a scalded dog. I'd love to know what he did. What I'm guessing he did was, put bigger air jets in it. Becuase I took apart my carb on that bike once and it had a 160 main jet. I dropped to a 152 in my '02 and it still runs like crap! Any help!!! Thanks!