Yamaha - Main Nozzle Carburetor Fuel Metering Component 7CT-1495U-1A-00. Overview. Main nozzles are one of those parts you really feel when you're running at speed. If it's not flowing right, the engine can feel flat or struggle under load. I've seen engines lose top-end performance just from buildup or wear in this piece. When it's clean and correct, the motor pulls strong and runs smooth through the throttle range.. Key Features. • High-Speed Fuel Delivery - Controls fuel flow through the carburetor at mid to full throttle.• Precision Metering Design - Ensures accurate fuel distribution for consistent combustion.• OEM Fit and Function - Built to factory specifications for proper installation and performance.• Supports Smooth Acceleration - Helps maintain steady power and eliminate hesitation under load.. Engine & Boat Compatibility. Designed for Yamaha outboard engines equipped with carbureted fuel systems that utilize a main nozzle for fuel delivery. Commonly used across a range of