2015 Yamaha Viper Weight, Horsepower and First Ride Report
2015 Yamaha Viper Weight, Horsepower and First Ride Report: 2015 Yamaha SR Viper M-TX SE/LE and SR Viper X-TX LE
Riding the new 2015 Yamaha mountain sleds near West Yellowstone, Montana, we now see Yamaha’s renewed commitment to mountain riders. All 7 Viper variations were equipped with the Mountain Performance (MPI) turbo set at 6 pounds of boost. At that level we get 180 horsepower, a little more than a M1100 Turbo. The Arctic Cat is running about 14 pounds of boost and gets 175 horsepower.
Yamaha staff at the ride only had preliminary numbers for weight and power. Calibrations for clutching, suspension and turbo mapping have not been finalized. These were all prototypes that will never be sold to the public.
We expect a 2015 Yamaha SR Viper M-TX 162” to be about 600 pounds wet weight. This would make it about 35 pounds lighter than a 2014 Arctic Cat M9000 162” and about 25 pounds heavier than a 2014 Arctic Cat M8000 162” with a turbo and electric start. 25 pounds heavier than the M8. Take a 2014 Polaris Pro RMK 800 163” with a turbo and electric start (the lightest sled on the market with those specs), and your only about 60 pounds difference.
We all know dry weight is bogus. I don’t know anyone that rides a sled dry. The best comparison for weight will be weights of production sleds, wet with 3 gallons of fuel in every and two quarts of oil in the oil tanks of the 2 strokes. Sledrumors plans to weight each of the sleds this way after they are delivered in the Fall. What do you think about these weight claims/estimates? Give us your comments below.
I don’t know if anyone will buy a 2015 Yamaha SR Viper M-TX SE/LE or a SR Viper X-TX LE without a turbo, but for mountain riding, boost makes all the difference on this sled. Yamaha is offering a MPI Turbo with airbox instead of intercooler and will be set for 6-7 pounds of boost at 180 HP. All this for $2,000 more on the Powersurge Program making it a no-brainer to drop $500 in the Spring to reserve one.
From there, we have two options, 1) ride the sled under factory warranty with a Yamaha dealer installed turbo or 2) work with a dealer that will exchange the airbox and standard wastegate for the upgraded MPI intercooler and better components. Use race gas and turn boost to 12-15 lbs to get up to 230 horsepower.
After riding each of the models, banging on hills and riding through the trees, there are some obvious opportunities to improve the Viper. In the deep powder, the skis feel too narrow, and they are. They ought to work a deal with SLP and bolt on the new Mohawk or something a little wider. The bumpers are still weak and Speedwerx has some good options. The Fox Evol shocks were setup too stiff, but Yamaha explained that they were still working on calibration settings. It was what wasn’t disappointing that was shocking.
The sleds were all light and nimble, especially the 2015 SR Viper X-TX 141 with the 2.25 track. (this one is only available with that track on Powersurge orders) The Fox Float 3 shock were almost perfect on the LE models. The clutch engagement is low, the power comes on early and builds quickly when you want it, a torque monster with plenty of punch to pack the ski’s if you want it. Sidehilling was easy, tight turns on and off power in the trees was unlike any other 4-stroke sleds we’ve ridden.
Differences between Yamaha and Arctic Cat versions
Yamaha has their own clutching calibrations, a partnership with MPI for boost and suspension settings. In addition, the rails and front torque arm are new from Yamaha. The windshield makes it look more Yamaha, but it’s weird. Yamaha also made the vertical steering post stiffer and more durable, and we could feel it on the ride. Overall, Yamaha was very involved in pre-production quality control to meet or exceed the Yamaha durability, fit and finish standards.