It's a 900 cc non turbo two stroke. 850 boast isn't that reliable so hopefully this engine will be proven to be realible with time. Haven't heard of many issues with it yet. Suppose to be around 175 hp. 650, 140, 850 is 165 ish. Just a tad more than 850.  Polaris four stroke is a joke. I wouldn't buy one. 

Ah I thought it was a 4 stroke. 

Nice looking sled. Hopefully weather holds for another month 👍

I believe Poo calls there 4-stroke an S4

My son is on his own for his next dirt bike or sled upgrade. We have set him up with his base - but moving forward he's on for the upgraded units. We'll help where we can, but he understands how lucky he is to have what he has now