Polaris Indy 650 Engine Specs

Polaris created its first snowmobile in December of 1955 and have not stopped production ever since. Over the years, Polaris snowmobiles have evolved into a leadership position in the industry, striving to maintain the best technology. The Polaris Indy 650 engine reflects these efforts, using an electronic fuel injection system that features computerized control of the engine. Also, an array of sensors deliver crucial telemetry to help guide this technological breakthrough.

  1. Composition

    • The engine on a Polaris Indy 650 is a liquid-cooled, 648-cubic-centimeter Fuji with three cylinders. The bore has a diameter of 65.75 millimeters and the stroke measures 66 millimeters. The engine is the first to feature fuel injection for Polaris sleds, increasing fuel efficiency by up to 10 percent. The cylinders and heads for the EFI triple engine were designed specifically to allow it to breathe easier, providing more power.

    Fuel Injection and Handling

    • The Polaris Indy 650 has an electronic fuel injection system that automatically makes adjustments according to altitude by reading temperatures and atmospheric pressure, applying the necessary changes. As a result, the engine operates very well in mountainous conditions. The fuel handling system cleans and pressurizes the fuel, and holds up to 11.25 gallons. In addition to fuel injection, warm engine coolant is injected by the computerized system to keep the throttle bodies warmed up.

    Electronic Control System

    • Polaris Indy 650 engines feature an electronic control system that uses five sensor inputs to control the ratio of air to fuel for the fuel injection system. The electronic control system is capable of measuring atmospheric pressure, temperature, engine revolutions and throttle position. The data is obtained from the engine case and throttle bodies. The system also sets a limit for rpm, ensuring that the engine avoids revving too fast.