Changing the oil filter of a KTM Duke 200 is a fundamental operation to maintain optimal engine performance. Start by making sure the bike is on a flat and stable surface, possibly using a stand to lift it. Before starting, slightly warm up the engine, as warm oil flows more easily. Then turn off the bike and prepare a container to collect the used oil. Remove the drain plug and let the oil drain completely. After draining the oil, locate the oil filter, which is usually located on the side of the engine. Use an oil filter wrench or a special pliers to carefully unscrew the filter, as it may still contain oil. Before installing the new filter, it is advisable to brush a little new oil on the filter gasket to ensure a better seal. Then screw the new filter by hand, making sure it is securely tightened but without overdoing it to avoid damaging it. After replacing the filter, replace the drain plug and fill the engine with new oil through the fill plug, always checking the recommended quantities in the bike manual. Finally, start the engine and let it run for a few minutes, checking for any leaks from the filter and drain plug. If everything is in order, turn off the bike and check the oil level with the dipstick, adding more oil if necessary. Finish the operation by checking for leaks and ensuring that the engine runs smoothly.