2015 Sportsman 850 acceleration

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Hey all I have a question I purchased an 15 850 Sportsman a few months back and last night took for a little burn and wanted to see how fast it would go at wide open throttle approx. 58 through about 70 it was surging/bucking/bogging this is my first 850 I also have a 10 Sportsman 500 touring. I guess question do these machines have some kind of governor??? Or may they be a problem??? Thanks!!!! BTW I know really should be going that fast.