Yamaha - Pilot Jet #41.3 Carburetor Fuel Metering Component 7CU-1414J-16-A0. Overview. Pilot jets are one of the first things I check when an engine won't idle right or feels off coming off throttle. It doesn't take much-just a little buildup or the wrong size-and you'll feel it immediately. I've seen engines smooth out completely just by putting in the correct jet. When it's right, idle settles down and throttle pickup feels clean and responsive.. Key Features. • Low-Speed Fuel Control - Regulates fuel flow at idle and low throttle for smooth operation.• Precision Jet Sizing - Calibrated at 41.3 for accurate fuel-air mixture in carbureted systems.• OEM Threaded Fit - Installs cleanly into the carburetor with proper seating and alignment.• Improves Idle Stability - Helps eliminate stalling, hesitation, and uneven low-speed performance.. Engine & Boat Compatibility. Designed for Yamaha outboard engines equipped with carbureted fuel systems that utilize a pilot jet for low-speed fuel con