Yamaha FX HO, FX Cruiser HO Waverunner 2021 Owner's Manual

To winterize your Yamaha FX HO Waverunner, start by thoroughly cleaning the exterior and flushing the engine with fresh water to remove salt and debris. Add a fuel stabilizer to the tank, run the engine for a few minutes to circulate the stabilizer, and then fog the engine with fogging oil. Drain all water from the engine and cooling system. Finally, remove the battery and store it in a cool, dry place.
Follow the maintenance schedule in the owner's manual. Generally, you should perform an oil change every 50 hours of use or annually, whichever comes first. Check and replace the spark plugs annually, inspect the hull and impeller for damage, and clean or replace the air filter as needed. Regularly inspect and tighten all hardware.
If your Yamaha FX HO is not starting, check the battery connections to ensure they are secure and corrosion-free. Test the battery voltage; a fully charged battery should read around 12.6 volts. Inspect the fuses and replace any that are blown. If the engine cranks but does not start, check the fuel system for clogs or stale fuel.
Use Yamalube 4W 10W-40 or a similar 4-stroke marine engine oil that meets or exceeds the specifications outlined in the owner’s manual. Using the correct oil helps ensure optimal performance and longevity of the engine.
To improve fuel efficiency, maintain a steady speed and avoid rapid acceleration. Keep the hull clean and free of marine growth. Regularly check and maintain the engine, including spark plugs and air filters, to ensure it runs efficiently. Avoid carrying unnecessary weight.
If your FX Cruiser HO overheats, immediately shut off the engine. Check for obstructions in the cooling water intake and remove any debris. Let the engine cool down before restarting. Inspect the cooling system for leaks or damaged hoses. If the problem persists, consult a Yamaha dealer.
To flush the engine, attach a garden hose to the flushing connector on the Waverunner. Start the engine before turning on the water. Let it run for about 5 minutes to flush out salt and debris. Turn off the water before stopping the engine to prevent water from backflowing into the engine.
During the first 10 hours of operation, avoid full throttle and vary the engine speed. Gradually increase the throttle but do not use full throttle for extended periods. This process helps the engine components to settle and ensures long-term performance and reliability.
After each use, rinse the hull with fresh water to remove salt and debris. Use a mild detergent and a soft brush or sponge to clean the surface. Inspect for any damage or scratches. Apply a marine wax periodically to protect the finish and improve water glide.
If your FX Cruiser HO is losing power, check the fuel system for clogs or water contamination. Inspect the air filter for dirt or obstructions. Make sure the spark plugs are in good condition and properly gapped. Check the impeller and pump for damage or debris.