Yamaha YFM350FAS Bruin 350 2004 Owner's Manual

To perform a basic oil change, warm up the engine, place an oil pan underneath, remove the drain plug and let the oil drain completely. Replace the drain plug, remove the oil filter, and install a new one. Finally, fill the engine with the recommended oil type and quantity.
The recommended spark plug for the Yamaha YFM350FAS Bruin 350 2004 is NGK DR8EA. Ensure it's properly gapped to 0.6 - 0.7 mm before installation.
If the Bruin 350 won't start, check the battery charge, inspect the spark plug, and ensure there is enough fuel. Also, verify that the kill switch is in the 'run' position and examine the starter relay and fuses.
The recommended tire pressure is 4.4 psi for the front tires and 3.6 psi for the rear tires. Always check and adjust the pressure when the tires are cold.
To adjust the idle speed, locate the idle adjustment screw on the carburetor. Start the ATV and turn the screw clockwise to increase the idle speed or counterclockwise to decrease it, aiming for an idle of 1400-1500 RPM.
Regular maintenance should be conducted as follows: oil change every 6 months or 600 miles, air filter cleaning every 3 months or 300 miles, and checking brake fluid and coolant levels monthly.
To check the brake fluid level, locate the brake fluid reservoir on the handlebar. Ensure the fluid is between the minimum and maximum marks on the reservoir. Add DOT 4 brake fluid if necessary.
If the Bruin 350 overheats, stop the engine immediately, allow it to cool, then check the coolant level. Inspect for any leaks or blockages in the radiator and hoses. Refill coolant as needed and consult a mechanic if the issue persists.
To clean the air filter, remove the airbox cover, take out the filter, and wash it with mild soap and water. After drying, apply air filter oil evenly before reinstalling. Ensure all components are securely reassembled.
The recommended coolant for the Yamaha YFM350FAS Bruin 350 2004 is a 50/50 blend of ethylene glycol antifreeze and distilled water. Make sure to use a coolant that is safe for aluminum engines.