Yamaha GP1800 Waverunner 2017 Owner's Manual

The recommended maintenance schedule includes: checking the engine oil and cooling system every 10 hours, inspecting the battery and fuel system every 25 hours, and performing a comprehensive check-up every season or 100 hours. Regularly inspect and clean the hull and jet pump. Ensure that the spark plugs are checked and replaced as needed.
To improve fuel efficiency, ensure the Waverunner is well-maintained with clean filters and properly inflated tires. Avoid idling for long periods and operate at a steady speed. Remove any unnecessary weight and ensure the hull is clean to reduce drag.
First, check the battery connections and ensure the battery is charged. Inspect the fuel level and fuel filter for any blockage. Verify the kill switch is in place and functioning. If the problem persists, consult a qualified technician to inspect the electrical and ignition systems.
To winterize your Waverunner, start by cleaning it thoroughly and draining any water from the engine. Stabilize the fuel and run the engine briefly to circulate the stabilizer. Remove the battery and store it in a cool, dry place. Lubricate moving parts and cover the Waverunner securely to protect it from the elements.
Yamaha recommends using Yamalube 4W 10W-40 oil for the GP1800 Waverunner. This oil is specially formulated for marine engines to provide optimal performance and protection.
Check the cooling system hoses for blockages or leaks and ensure the water intake is unobstructed. Verify that the impeller is not damaged and that the coolant levels are sufficient. If overheating persists, have a technician inspect the thermostat and cooling passages.
Common signs include irregular engine noise, reduced performance, difficulty starting, visible hull damage, and increased fuel consumption. Regularly inspect the impeller and jet pump for wear, and check for any cracks or damage to the hull.
To clean the hull, rinse it with fresh water after each use to remove salt and debris. Use a mild detergent and soft brush for stubborn stains. Regularly apply a marine wax to protect the finish. Inspect the hull for cracks or damage and repair as necessary.
Excessive vibration can be caused by debris in the impeller, a damaged impeller or shaft, or loose engine mounts. Inspect the impeller for obstructions and ensure it is not bent or damaged. Check all engine mounts and fasteners for tightness.
To replace the spark plugs, first, remove the seat and engine cover to access the engine. Disconnect the spark plug wires and use a spark plug socket to remove the old plugs. Install new spark plugs, ensuring they are gapped correctly, and reconnect the spark plug wires.