Yamaha GP1800R HO Waverunner 2020 Owner's Manual

The recommended maintenance schedule includes inspecting the engine oil, checking the jet pump, and flushing the cooling system after each use. An annual service should include changing the engine oil and filter, checking the spark plugs, and inspecting the hull and deck for damage.

To winterize the Waverunner, first clean and dry the exterior. Flush the cooling system with fresh water and drain all water from the engine. Add a fuel stabilizer to the fuel tank, change the oil and oil filter, and remove the battery for storage in a cool, dry place.

Check the battery connections and ensure the battery is charged. Inspect the spark plugs for wear and replace if necessary. Ensure the fuel tank has fresh fuel and check the fuel lines for blockages. If the issue persists, consult a professional technician.

To improve fuel efficiency, ensure the Waverunner is well-maintained, including regular oil changes and clean spark plugs. Avoid excessive idling and keep a steady speed when riding. Properly trim the Waverunner and keep the hull clean to reduce drag.

Yamaha recommends using Yamalube 4W 10W-40 for the GP1800R HO Waverunner. This oil is specifically formulated for marine engines and provides excellent lubrication and protection.

It is recommended to inspect the spark plugs every 50 hours of operation or annually, whichever comes first. Replace them if they show signs of wear or fouling to ensure optimal engine performance.

To flush the cooling system, attach a garden hose to the flush port, start the engine, and then turn on the water. Let it run for a few minutes, then turn off the water before stopping the engine. This removes salt, sand, and debris from the system.

Check for debris or damage in the jet pump or impeller, as these are common causes of vibration. Inspect the engine mounts and hull for any signs of damage. If the vibration persists, consult a professional technician for further diagnosis.

Regular maintenance, such as oil changes and inspections, is crucial. Store the Waverunner in a dry, sheltered place, and use a cover to protect it from the elements. Follow proper operating procedures and avoid running in shallow or debris-filled waters.

To prevent corrosion, rinse the Waverunner with fresh water after each use, especially if used in saltwater. Apply a marine-grade corrosion inhibitor to metal components and check for any signs of corrosion regularly.