rmk 600 bog on top end

[alaskarider]

Hey guys, I just got a 2010 rmk 600 that has a bog at top end. Basically 50 % of the time or more when I hold it wide open it bogs and looses rpm down to 6500 or so. I replaced the gas and added seafoam and removed and cleaned the exhaust valves and checked the bellows. The sled has 1200 miles on it. Any ideas before I take it to the dealer? Thanks.

 

[Blackzed]

reeds maybe

 

[maxbed]

give it better air