620-14211-00 Yamaha NEEDLE IDLE

Yamaha needle idle 620-14211-00 is a precision carburetor component that controls fuel flow at idle speeds in Yamaha marine outboards. The needle valve regulates air-fuel mixture richness when the engine runs at rest, enabling stable idle and smooth throttle engagement. This OEM part requires careful adjustment for optimal performance. Worn, stuck, or corroded needles cause rough idle, stalling, or poor low-speed response. Clean or replace as needed per service manual.