Polaris Sportsman 400 H.O, Sportsman Owner's Manual
![Polaris Sportsman 400 H.O, Sportsman manual cover](/images/91350e7bb32041934dd38933/thumbs/thumb175x175.webp)
To break in a new engine, avoid prolonged idling, vary the engine RPM, and avoid high-speed operation for the first 10 hours. Be sure to check and adjust the engine oil level frequently.
Check the battery connections to ensure they are clean and tight, verify that the fuel is fresh, and inspect the spark plug for wear or damage. If the problem persists, consult a Polaris dealer.
Change the oil and filter every 50 hours of operation, every six months, or after every 1,000 miles, whichever comes first. Always use the recommended oil type specified in the owner's manual.
The recommended tire pressure is 5 psi for the front tires and 5 psi for the rear tires. Always check tire pressure when the tires are cold and adjust as needed.
Maintain proper tire pressure, perform regular maintenance, and avoid carrying unnecessary weight. Use the recommended fuel type and avoid aggressive acceleration and high-speed driving.
Stop the engine immediately and allow it to cool. Check the coolant level and inspect the radiator and fan for obstructions. Ensure the cooling system is functioning properly before resuming operation.
Remove the air filter cover, take out the air filter, and gently clean it with compressed air or wash it with warm soapy water. Allow it to dry completely before reinstalling. Replace it if it is damaged or excessively dirty.
Clean the ATV thoroughly, change the oil, fill the fuel tank, and add a fuel stabilizer. Disconnect the battery and store it in a cool, dry place. Cover the ATV to protect it from dust and moisture.
Check the battery voltage and connections, inspect fuses, and verify that all electrical components are in good condition. Consult the electrical wiring diagram in the service manual for further diagnostics.
Check tire pressure, oil level, coolant level, and brake operation. Inspect the drive chain and sprockets, and ensure all lights and indicators are functioning properly.