How often should the air filter of CFMOTO 650NK be replaced?
2 Answers
You can refer to the replacement interval suggested in the manufacturer's maintenance manual. Generally, it is recommended to replace the air filter every 10,000-15,000 kilometers. Over time, a clogged air filter can affect the engine's air intake, altering the air-fuel ratio inside the engine, which may lead to reduced vehicle power and increased fuel consumption, among other issues. Air Filter: It refers to a device that removes particulate impurities from the air. For piston machinery (such as internal combustion engines, reciprocating compressors, etc.), if the inhaled air contains dust or other impurities, it will accelerate the wear of components. Therefore, an air filter is essential. The air filter consists of two parts: the filter element and the housing. The main requirements for an air filter are high filtration efficiency, low flow resistance, and the ability to operate continuously for extended periods without maintenance. Function of the Air Filter: The air filter is installed in front of the carburetor or intake pipe to filter out dust and sand particles from the air, ensuring that sufficient and clean air enters the cylinders. The air filter is a seemingly insignificant component because it does not directly relate to the vehicle's technical performance. However, in practical use, the air filter significantly impacts the engine's lifespan.
I've been riding my CFMOTO 650NK for several years and found that air filter replacement depends on riding habits and environment. For daily urban commuting with decent air quality, I usually check it every 8,000 km. But if riding off-road or in dusty areas, dust clogs the filter much faster—sometimes requiring replacement at 5,000 km. The inspection process is simple: remove the side cover and shine a flashlight on the filter paper—replace it if dirty or clogged. Neglecting this restricts airflow to the engine, spiking fuel consumption and reducing power, while long-term neglect risks cylinder wear. Filters are affordable (just tens of RMB each) and quick to replace (10 minutes tops). I recommend aligning replacements with seasonal maintenance, checking more frequently in winter/spring—especially during humid rainy seasons when filter paper molds easily. Regular checks keep your bike in top shape for smoother, safer rides.
