That V-1000 4 stroke is virtually identical to the unit that Rotax makes for Aprilia motorcycles. When used in their RSV Mille bike, it produces 130 HP. In sport touring form in the 1000 Falco model, it makes about 100. The 4-Tek engine used in the PWC could make 200 HP easily for snowmobile applications. The only problem would be weight, which is rather high. The Sea Doo GTX with a 900+ cc 2 stroke weighs in at 70 lbs. less than the same unit with the 4 stroke. As far as weight goes, even though Yamaha says that the RX-1 weighs only 5% more than the SRX-700, they're bending the truth a little in doing so. Apples to apples, the SRX weighs about 520 dry, so in this context, the RX-1 would weigh in at about 550, which is in the range of an 800 triple/triple. What Yamaha isn't saying loudly is that it is 5% more weight than a similarly equipped SRX, namely with a battery and electric starter. A further fudge factor is the fact that since the RX-1 will get much better gas mileage, it's gas tank is smaller by maybe a couple of gallons, and they're figuring this weight savings as well. I think you'll find that the true "equivalent dry weight" of the RX-1 will be closer to 580-590 lbs. by the time all is said and done. Yeah, it has better torque by a long shot. but physics is still physics. You still have to hook the torque to the snow and you still have to change direction in a given amount of time while negotiating the twisties. I'll try out the REV 800 for next year, and see what comes up after that.