2018 Yamaha SR Viper R-TX, 2018 Yamaha SR Viper L-TX LONGER TRAVEL. LARGER FOOTPRINT. Long track snowmobiles have become popular for big mile trail riders. Features may include: Genesis 1049cc High Performance Engine The 3-cylinder Genesis engine has been regarded as the industry’s best four-stroke engine. Featuring a sophisticated closed-loop fuel injection system and 4-valves per cylinder, the 1049 engine delivers a class-leading horsepower, instant throttle response and a thick torque curve that jettisons you from corner to corner in a blink of an eye. All with great fuel economy and a reputation for bulletproof durability. Dual Shock SR 137 Rear Suspension The Dual Shock SR 137 rear suspension is the cumulative result of years of punishment and development in snocross and cross-country competition. This long travel suspension offers premium ride comfort with additional bump bridging capabilities, floatation and traction thanks to its stretched length. The SR 137 is a “coupled” suspension that utilizes a unique “sliding” front arm mount. With up to half-inch of movement at the front arms “slot”, the system allows the SR 137 to deliver controlled (reduced) ski-lift during acceleration while still retaining front arm bump compliance. YVXC Clutching Featuring Yamaha drive and driven clutching, the YVXC system delivers smooth engagement, instant acceleration, fast reacting backshift, and cool operating temperatures for a long belt life. The YVXC clutch system delivers Yamaha’s hallmark smooth power delivery, responsive engine feel and unmatched quality. Tuner III Skis Our Deep Keel Tuner III Skis are engineered specifically for the SRV Chassis coupled with the high-torque response of the Genesis 4-Stroke. They deliver reduced ski-pressure and near effortless steering; and the dual keel design delivers an assured “bite” in the corners with reduced darting. The design also allows you to customize the handling and feel of your sled with easy to change carbide runners in a variety of insert lengths for the inner and outer keel. Rip Saw II Track Regarded as the best high-performance terrain track available, the 1.25-inch lug design of the RipSaw II delivers incredible acceleration, braking control, and handling in a wide variety of conditions.