One of the the biggest surprises for us in testing the new sleds this Spring was how well the (boosted) 2015 Yamaha Viper MTX with the Mountain Performance turbo worked for us. Of course, we expected the power at elevation to be good, being boosted and all. The turbocharged SR Viper MTX will be making a full 180 HP while the competition’s 800 twins are only making 110 HP (or so) depending on the elevation. The SR Viper MTX might be slightly heavier, but with a nearly 70 horse advantage the power-to-weight ratio is clearly in Yamaha’s favor. But, what we didn’t expect was how easy it was to sidehill and put the sled precisely where we wanted to….even on a steep sidehill in fairly tight old growth pine trees. The 2015 Yamaha SR Viper MTX with the MPI turbo package is the first 4-stroke mountain sled that we truly felt confident riding in technical terrain, specifically how well it handled and responded in super technical boondocking areas. Add to this the power, durability and consistency it looks like Yamaha is going to be making some new highmarks in the mountain sled game for 2015.