Yamaha 10 Micron Fuel Filter Assembly Aluminum Head 1/4 Inch MAR-10MAS-00-00. Overview. The Yamaha 10 Micron Fuel Filter Assembly Aluminum Head 1/4 Inch MAR-10MAS-00-00 is a genuine Yamaha fuel filtration system designed to protect your outboard engine from harmful contaminants. This assembly filters fuel down to 10 microns, removing water, dirt, and debris before they reach sensitive fuel system components.. Clean fuel is critical for maintaining engine performance and reliability. Contaminants