Yamaha FX HO, FX Cruiser HO Waverunner 2012 Owner's Manual

To flush the engine, attach a garden hose to the flushing port, start the engine, and then turn on the water. Let it run for about 5 minutes, ensuring the engine is in neutral, to remove any salt and debris. Turn off the water before stopping the engine.
Use Yamalube 4W 10W-40 oil, specifically designed for WaveRunners. It's recommended to change the oil every 50 hours of operation or once a year, whichever comes first.
Check the battery connections for corrosion or loose cables, ensure the kill switch is properly attached, and inspect the fuel level. If these are fine, you may need to check the spark plugs or consult a professional technician.
Clean the exterior, flush the engine, add fuel stabilizer, and remove the battery to store in a cool, dry place. It's also advisable to fog the engine cylinders and cover the Waverunner to protect it from dust and moisture.
Rinse the hull with fresh water after each use, avoid beaching on abrasive surfaces, and regularly apply a marine-safe wax to protect against UV damage and maintain shine.
First, check for blockages in the intake grate or cooling water passages. Ensure the jet pump is not clogged with debris. If the problem persists, have the cooling system inspected by a professional.
Use a mild soap and water solution to clean the seats, avoiding harsh chemicals. Rinse thoroughly and let them dry completely. Applying a UV protectant can help prevent fading and cracking.
Remove the seat and engine cover, disconnect the spark plug wires, and use a spark plug wrench to remove the old plugs. Check the gaps on the new plugs and install them, ensuring they are securely tightened but not overtightened.
Maintain proper tire pressure, avoid carrying unnecessary weight, perform regular engine maintenance, and operate the Waverunner at optimal speeds rather than full throttle to improve fuel efficiency.
Signs include unusual vibrations, reduced speed and acceleration, and increased fuel consumption. Inspect the impeller for physical damage or wear and consider servicing it if any of these symptoms are present.