2018 Polaris 120 INDY, 2018 Polaris® 120 INDY® START OUT RIGHT. The INDY 120 snowmobile is the perfect first snowmobile for youth riders. Its 120 cc engine, safety tether and adjustable throttle help promote safe riding. Features may include: Adjustable Throttle The throttle is adjustable so an adult can control how much power is available to the rider. 120 cc Four Stroke Engine 120cc four-stroke engine is built for years of trouble free performance. Maintained properly, this sled can be handed down for years to come. Safety Tether Whether you’re just learning or a seasoned ISOC Pro, a tether is standard equipment. Should the rider separate from the sled, the engine dies. Unique shouldered design kills the engine if the hood is opened. Storage Convenient underseat storage for extra gloves, facemask or even some beef jerky.