Yamaha YFM09RYXK Raptor 90 2019 Owner's Manual

To properly break in the Yamaha Raptor 90, start by operating the engine at varying speeds and avoid full throttle for the first 10 hours. Gradually increase speed and load, allowing the engine to adapt. Regularly check and adjust the chain, and inspect the brakes during this period.
The recommended maintenance schedule includes checking oil levels before each ride, changing the oil every 6 months or 100 hours, inspecting and cleaning the air filter every 20 hours, and checking the brakes, tires, and chain tension regularly. Refer to the owner's manual for detailed intervals.
The engine may overheat due to low coolant levels, clogged radiator fins, or a malfunctioning thermostat. Ensure the coolant is at the correct level and the radiator is free from debris. If the problem persists, consult a professional technician.
If the Raptor 90 won't start, check the battery charge and connections, ensure the kill switch is in the run position, and inspect the spark plug for fouling. Additionally, verify that the fuel is fresh and the fuel valve is open.
Use Yamalube 4 10W-40 or 20W-50 oil for optimal performance, as recommended by Yamaha. Ensure the oil is suitable for wet clutches and meets the specified API service categories.
To adjust the chain tension, first elevate the rear wheels. Loosen the rear axle nut and the adjuster nuts on both sides of the swing arm. Adjust the chain to have 1.2 to 1.6 inches of slack, then tighten all nuts securely.
Power loss can be caused by a clogged air filter, dirty carburetor, or worn-out spark plug. Ensure the air filter is clean, the carburetor is properly adjusted and cleaned, and replace the spark plug if necessary.
To replace the air filter, remove the seat and the airbox cover. Take out the old air filter and clean the airbox. Install the new air filter and ensure it's seated properly. Replace the airbox cover and seat securely.
To check the brake fluid level, locate the brake fluid reservoir near the handlebars. Ensure the ATV is on a level surface and check the fluid level through the sight glass. The fluid should be between the minimum and maximum marks.
Common causes of suspension issues include worn-out shocks, incorrect preload settings, and damaged bushings. Regularly inspect the suspension components for wear and replace any damaged parts. Adjust the preload settings according to the rider's weight and riding conditions.