KTM Duke 390 2018 Owner's Manual

To adjust the chain tension, place the motorcycle on a stand, loosen the axle nut, and adjust the chain adjusters on both sides equally until the correct tension is achieved. Ensure there is 5-7 mm of slack in the chain. Tighten the axle nut and recheck the tension.
The recommended oil for the KTM Duke 390 2018 is a fully synthetic 15W-50 motor oil. Make sure it meets the specifications outlined in the owner's manual.
Oil should be changed every 7,500 kilometers (4,660 miles) or once a year, whichever comes first. More frequent changes may be necessary if the bike is used in extreme conditions.
Remove the air filter cover, take out the air filter, and use compressed air to remove dust and debris. If the filter is heavily soiled, wash it with a mild detergent, rinse, and let it dry completely before reinstallation.
To reset the service light, turn on the ignition, navigate to the service menu using the handlebar controls, and select 'Reset'. Follow the prompts on the display to complete the reset.
Check the battery connections, ensure the kill switch is in the correct position, and make sure there is fuel in the tank. If the problem persists, inspect the fuses and spark plug.
To check the coolant level, ensure the engine is cool, locate the coolant reservoir, and verify that the coolant is between the 'min' and 'max' marks. Top up with the recommended coolant if necessary.
The recommended tire pressure for the KTM Duke 390 2018 is 29 psi (2.0 bar) for the front tire and 32 psi (2.2 bar) for the rear tire. Regularly check and adjust the pressure as needed.
To improve fuel efficiency, maintain a steady speed, avoid excessive idling, ensure regular maintenance, and keep the tires properly inflated. Additionally, clean the air filter and use the recommended grade of fuel.
Regular maintenance includes oil changes, air filter cleaning, chain lubrication and adjustment, brake inspection, coolant level checks, and tire pressure monitoring. Follow the service schedule in the owner's manual.