The carburetor fitted to a 2005 Yamaha YZ450F is a Keihin FCR-MX39. This component is responsible for mixing air and fuel in the correct proportion to ensure efficient combustion within the engine. The FCR-MX39 utilizes a flat slide design known for its responsive throttle and improved performance.
Correct carburetor selection is critical for optimal engine performance, fuel economy, and overall reliability. The 2005 YZ450F’s Keihin carburetor was chosen to meet the specific demands of motocross racing, providing precise fuel delivery and a broad powerband. Proper maintenance and tuning of this carburetor are essential to maintaining its intended functionality and preventing performance degradation.
