800 H.O. Cleanfire® Engine

The “Proven Polaris® Benchmark”, is part of the Polaris® family of Liberty® engines built in the USA. This engine was developed in conjunction with the AXYS® platform to deliver ultimate responsiveness, performance and quality with class-leading power-to-weight.

800 ho cleanfire engine

Key Features

3-stage electronically-controlled exhaust valves
3-stage electronically-controlled exhaust valves

Provides improved running quality, crisp throttle response, smooth idle, and improved fuel economy. The active feedback for the exhaust valve position provides more accurate fueling in transient situations. These exhaust valves also improve combustion stability to improve durability and engine life.

Electronic oil pump
Electronic oil pump
Provides automatic break-in and more-precise oil delivery for optimal performance and durability. Reduces throttle effort by 20% and requires no adjustments.
Thermostat
Thermostat

Along with maintaining a lower operating temperature, this thermostat increases main circuit flow by 12 percent and increases bypass flow by 9 percent.

Exhaust gas temp sensor
Exhaust gas temp sensor

The durable exhaust gas temperature sensor (EGT) provides more than 200 percent life improvement, has an improved connector and more durable sensing element, and it is matched to the ECU.

Lightweight crankshaft
Lightweight crankshaft

Delivers low inertia and quick throttle response resulting in unrivaled acceleration. Designed and engineered specifically for the 800 Cleanfire® H.O. Engine, it delivers outstanding durability.

High-efficiency intake & exhaust
High-efficiency intake & exhaust

Porous intake duct material and the high-flow exhaust system create a better-breathing engine package for more power, and the silencer reduces sound levels. VForce Reeds provide improved performance, throttle response, and reed durability.

800 Cleanfire H.O. Engine Piston
800 Cleanfire® H.O. Engine Piston

The pistons have exhaust-side grooves for improve oil distribution, and the enhanced oiling improves piston and cylinder durability. Plus, the piston design reduces friction and wear, and improves efficiency and power.

Browse 800 Models

INDY®

Legendary Performance. Simply Fun. 

RUSH®

Sharpest Handling. Quickest Accelerating.