Electronic Variable Exhaust System (E-VES) Maintenance

Content Source: 2020 PRO-RMK / RMK ASSAULT / SKS 155 Owner’s Manual (9929772 R02) > Maintenance Chapter

IMPORTANT

The Owner's Manual for this vehicle contains warnings, instructions and other information you must read and fully understand before safely riding or performing maintenance on this vehicle.Always follow the warnings and instructions in Owner's Manual.

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Electronic Variable Exhaust System (E-VES) Maintenance

NOTE

Improper cleaning or valve assembly installation may cause severe engine damage! The ECU must be programmed by an authorized dealer if any component in the E-VES system is replaced or improperly serviced.

The engine in your Polaris snowmobile is equipped with E-VES. Periodic valve inspection and cleaning is not required or recommended as the exhaust valves do not rely on combustion pressure for operation. The E-VES system is designed to work when oil and carbon deposits form on the valves.

At the time of assembly, the valve range of travel is programmed into the engine management system. If blade travel is restricted for any reason, the engine management system will alert the rider and turn on the check engine MIL. E-VES service should only be performed by an authorized Polaris snowmobile dealer who has the tools and diagnostic software to properly service and program the system.

NOTE

During engine break-in, E-VES diagnostic codes may appear during engine operation as the valves wear into their cylinder slots. Contact your authorized dealer if the check engine MIL remains illuminated after the break-in period.