Yamaha - Main Jet #50 Carburetor Fuel Metering Component 7CU-E414J-50-A0. Overview. Main jets are where I start when an engine feels off at higher throttle. If it's clogged or worn, you'll notice it when the motor struggles to pull or just doesn't feel as strong as it should. I've seen engines wake right back up with the correct jet in place. When it's dialed in, you get smooth power all the way through the throttle range.. Key Features. • High-Speed Fuel Control - Regulates fuel delivery at mid to full throttle for consistent power output.• Precision Jet Sizing - Calibrated at 50 for accurate fuel-air mixture in carbureted systems.• OEM Threaded Fit - Installs securely into the carburetor with proper alignment and sealing.• Supports Strong Acceleration - Helps eliminate power loss and hesitation under load.. Engine & Boat Compatibility. Designed for Yamaha outboard engines equipped with carbureted fuel systems that utilize a main jet for fuel delivery at higher throttle ranges. Common