The foam filter for Montesa 4T motorcycles is a replacement component used in the air intake system of the motorcycle. The air filter is responsible for cleaning the air that enters the engine, preventing dirt and dust particles from entering that could damage the internal components of the engine. The foam filter is an essential piece to keep the engine running properly. It is specific for Montesa 4T motorcycles, perfectly fits the air intake system and it is recommended to replace it regularly to ensure proper engine performance.Referencia: HR9121