I had the same issue with my 09' touring 800. The issue was a rear cv joint that was bad. It only did the clicking when turning. Luckily it was under warranty, so I can't tell you how much it was to fix. It sounds to me like it is a common problem.
The dealership that sold me my Touring 800 I have was the sixth out of 18 that were sold that had this issue.
09' Sportsman 800 Touring - K&N Filter & PreFilter - Dalton Primary Clutch Spring - Polaris 3500 Winch - Deluxe Front Brush Guard - Rear Bumper - Polaris 60" Plow - Handguards - 3 Headlight Mod - Amsteel Winch Rope -Pitbull 25.5" Growler Tires