Yamaha FX HO, FX Cruiser HO Waverunner 2016 Owner's Manual

The recommended maintenance schedule includes flushing the engine after each use, checking the oil level regularly, changing the oil and filter every 50 hours or annually, inspecting the spark plugs, and lubricating moving parts. An annual inspection by a certified Yamaha technician is also advised.
To flush the engine, connect a garden hose to the flush port on the Waverunner. Start the engine before turning on the water. Allow the engine to idle for about 3-5 minutes, then turn off the water before stopping the engine.
Check the battery connections for corrosion or looseness, ensure the kill switch is properly attached, and verify that there's adequate fuel. If it still doesn't start, inspect the spark plugs and consider replacing them if necessary.
Ensure the intake grate and cooling water passages are free from debris. Check the coolant level and inspect the impeller for damage. If the issue persists, consult a Yamaha technician for further diagnosis.
Yamaha recommends using Yamalube 4M FC-W 10W-40 oil for optimal performance and protection in your Waverunner. Always ensure you use marine-grade oil to avoid engine damage.
To winterize, flush the engine with fresh water, add fuel stabilizer, change the engine oil and filter, remove the battery for storage, and cover the Waverunner with a protective cover. Store it in a dry and cool place.
Use a mild detergent and water to clean the hull, applying with a soft sponge or cloth. Rinse thoroughly with fresh water and dry with a clean towel to prevent water spots. Avoid using abrasive materials that could scratch the surface.
Maintain a steady speed and avoid rapid acceleration. Ensure the hull and engine are clean and well-maintained, and avoid carrying unnecessary weight. Regular maintenance like oil changes and spark plug checks can also improve efficiency.
Inspect the impeller and jet pump for debris or damage. Check the engine mounts for wear and ensure they are securely fastened. If the issue continues, a professional inspection may be necessary to identify any underlying problems.
Ensure the Waverunner is properly seated on the trailer and secured with straps or tie-downs at the front and rear. Check that the trailer lights and brakes are functioning, and inspect the hitch and safety chains before towing.