How to Clean a Rotax Adjustable Variable Exhaust

Rotax Adjustable Variable Exhaust valves are mechanisms mounted to the cylinders of a Ski-doo. Their purpose is to reduce the size of the exhaust port in order to increase exhaust pressure. Increased exhaust pressure increases the performance of the engine. Rotax Adjustable Variable Exhaust valves may become soiled from poor quality fuel and extended use. In order to improve the performance of a Ski-doo, cleaning the RAVE valves is an option.

Things You'll Need

  • Rotax 276070 tool
  • Allen wrench
  • Metric wrench
  • Needle-nose pliers (optional)
  • Clean rags
  • Mild abrasive cleaning paste
  • Plastic cleaning pad (optional)
  • Brake cleaner
  • Putty knife
  • Cylinder gasket
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Instructions

    • 1

      Remove the spring clip from the body housing of the RAVE. by pulling on the bottom of the spring. The spring is wrapped around the neck of the valve cover, the bottom of the spring is bent around the valve casing. Remove the valve cover after detaching the spring. Remove the compression spring from the bellows by twisting counterclockwise. Remove the hose spring using the Rotax 276070 tool

    • 2

      Remove the two Allen screws securing the base to the cylinder. Remove the base and gasket. Remove the exhaust valve piston from the stud screw on the housing body using your fingers. If necessary, use ta metric socket wrench or needle-nose pliers. Pull the bellows from the valve housing. It is a rubber bell-shaped gasket that removes easily.

    • 3

      Remove the O-ring from the stud screw by hand and pull it off the valve rod housing. Peel the gasket off the cylinder. If necessary, scrape it off with a putty knife. Grasp the valve rod and pull the exhaust valve out of the body housing.

    • 4

      Wipe the exhaust valve down with a rag covered with a mild abrasive paste, or use a plastic cleaning pad. With a second rag, clean the valve with brake cleaner. Wipe the cylinder of the body housing clean with brake cleaner. Place the exhaust valve back in the body housing. Place a new gasket on the cylinder and reassemble the RAVE.