2017 Yamaha SRX 120, 2017 Yamaha SRX 120 Proven Yamaha 123cc engine is surrounded by a rugged chassis, lightweight and easy to glide plastic skis, and working torsion spring suspension. Features may include: 123cc Yamaha Engine The easy to start 123cc genuine Yamaha engine delivers spunky performance and years of rock solid reliability. Tether Switch An integrated switch automatically shuts-down the engine when ever the driver is not on-board or the hood is lifted open. High Visibility Whip Flag A standard, rear mount, high-visibility whip flag delivers high-level awareness for those in the area as your youngster hones his or her skills. Torsion Spring Rear Suspension Just like the big sleds, the SRX 120 features a fully-functional slide-rail torsion spring suspension serving up 4.5-inches of travel.