Yamaha YP400E Majesty 2014 Owner's Manual

It is recommended to change the oil every 3,000 miles or every 6 months, whichever comes first, to ensure optimal performance and longevity of the engine.
Use a high-quality ethylene glycol-based coolant with corrosion inhibitors specifically designed for aluminum engines. Ensure it is a 50/50 mix of coolant and distilled water.
First, check the battery for a full charge. Ensure the kill switch is in the 'run' position and the side stand is up. Check the fuel level and ensure the engine cut-off switch is not engaged.
The recommended tire pressure is 29 psi for the front tire and 33 psi for the rear tire. Always check the pressure when the tires are cold.
To replace the air filter, remove the seat and the storage compartment to access the air filter cover. Unscrew the cover, remove the old filter, and replace it with a new one. Reassemble the components.
Spongy brakes may indicate air in the brake lines or low brake fluid. Check the brake fluid level and bleed the brakes to remove any air. If the problem persists, inspect the brake lines for leaks.
Regularly check the battery terminals for corrosion, keep the battery fully charged, and store the scooter in a dry place. Consider using a battery tender if the scooter is not used frequently.
Excessive vibration may be due to unbalanced tires or worn suspension components. Check the tire balance and inspect the suspension for wear and damage. Replace any worn parts as necessary.
Locate the headlight adjustment screws near the headlight assembly. Adjust horizontally or vertically as needed by turning the screws to achieve the proper aim.
Signs that the drive belt needs replacement include a squealing noise, visible wear or cracking on the belt, and a noticeable loss of power or acceleration. Check the belt regularly and replace it if any of these symptoms are present.