I have a 2007 Sportsman 800 EFI. It's low hours, like 28 and under 300 miles but I purchased it used so I am going through each and every maintenance item I can. I have the service manual and it states Valve Clearance check at 100 hours/620 miles or every 12 months.
I cannot find in the service manual how to adjust and what the clearance should be. I have found other incorrect information in the manual and I see a diagram stating it has hydrolic adjustment.
Therefore, I conlude and hope that you do not need Vlave Clearance checking.