Yamaha EX, EX Sport, EX Deluxe, EX Limited Waverunner 2021 Owner's Manual

To start the Yamaha EX Waverunner, ensure the safety lanyard is attached, the engine is in neutral, and the start/stop button is pressed until the engine ignites. Always start the engine with the watercraft in water to avoid overheating.
If the engine won't start, check the battery connections, ensure the safety lanyard is properly attached, verify there is fuel in the tank, and inspect the spark plugs for wear or damage.
Regular maintenance should be performed every 50 hours of operation or annually, whichever comes first. This includes checking the oil level, inspecting the hull, and cleaning the cooling system.
After each ride in saltwater, flush the engine by attaching a garden hose to the flush port, starting the engine, and running water through the system for a few minutes. Ensure the engine is running before turning on the water to avoid flooding.
To maintain battery health, keep it charged when not in use, avoid exposing it to extreme temperatures, and check for corrosion on terminals regularly. Consider using a battery maintainer during the off-season.
If the Waverunner takes on water, check the drain plugs to ensure they are securely tightened, inspect the hull for any damage or cracks, and make sure the bilge pump is functioning properly.
To improve fuel efficiency, avoid rapid acceleration and deceleration, maintain a steady speed, keep the Waverunner's hull clean, and ensure proper engine maintenance.
For off-season storage, clean the Waverunner thoroughly, add fuel stabilizer to the tank, remove the battery and store it in a cool, dry place, and cover the watercraft to protect it from dust and moisture.
If overheating occurs, stop the engine immediately, check for debris blocking the cooling intake, ensure the cooling system is functioning, and allow the engine to cool before restarting. Consult a technician if the problem persists.
Before each ride, check the safety lanyard function, inspect throttle and steering operation, verify fuel and oil levels, ensure the fire extinguisher is accessible, and review weather conditions.