Yamaha GP1800 Waverunner 2018 Owner's Manual
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The recommended engine oil for the Yamaha GP1800 Waverunner 2018 is Yamalube 4W 10W-40 for optimum performance and protection.
It is recommended to change the oil every 50 hours of operation or at least once a year, whichever comes first.
To flush the cooling system, connect a garden hose to the flushing port, start the engine, and let water flow for about 3 minutes. Ensure the engine is off before disconnecting the hose.
To prevent corrosion, rinse the Waverunner with fresh water after each use, especially if used in saltwater, and apply a corrosion protection spray to metal parts.
Check the battery charge, ensure the safety lanyard is properly attached, inspect the fuel level, and verify that the ignition switch is in the correct position.
To winterize, stabilize the fuel, flush the cooling system, remove the battery for storage, and cover the Waverunner to protect it from the elements.
Refer to the trailer's tire sidewall or the trailer manual for the recommended tire pressure, typically around 50 PSI for standard trailer tires.
Performance can be enhanced by upgrading the impeller, installing a performance intake grate, and using high-octane fuel.
After each ride, flush the cooling system, rinse the exterior, check the hull for damage, and ensure all components are secure.
Error codes can be checked by using a diagnostic tool compatible with Yamaha's onboard diagnostics system, or by consulting a Yamaha dealer.