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. Commonly used across a range of Yamaha outboards where consistent power and fuel control are essential.

FAQ

Q: What are signs the main jet is clogged?
A: Loss of top-end power, hesitation under throttle, or the engine not reaching full speed are common signs.

Q: Can I clean the main jet instead of replacing it?
A: You can try cleaning it, but if performance doesn’t improve, replacing it is the better option.

Q: Does the jet size affect engine performance?
A: Yes, the size directly impacts fuel delivery and can change how the engine runs at higher speeds.

Q: How does fuel quality affect this part?
A: Dirty or old fuel can clog the jet and restrict fuel flow, leading to performance issues.

Q: Any tips for installation?
A: Install it carefully without over-tightening and make sure the carburetor is clean before reassembly.