Genuine Carburetor Air Mixture Setting Screw for Yamaha FZ Old Series (SKU: 16155-885-297)

Micro-Toleranced Taper Tip: Designed with an exact needle point taper angle to ensure incremental, predictable air-fuel mixture changes down to a 1/4 turn.

Vibration-Resistant Threading: Features precision-cut threads that prevent the screw from slowly backing out or shifting under constant engine resonance.

High-Grade Mechanical Brass: Machined from durable, non-corrosive brass to completely eliminate the risk of seizing or stripping inside the aluminum carburetor body.

Restored Idle Quality: Cleans up the low-end pilot circuit loop to eliminate deceleration popping, rough idle surges, and stalling.

Exact OEM Specification: Manufactured to match factory geometry guidelines for seamless depth placement inside your original mixing column.

Experiencing low-end throttle hesitation, poor fuel economy, or sudden stalling at traffic stops? The fine tip of your factory pilot circuit screw might be blunt, or its internal threads could be damaged from over-tightening.

The Carburetor Air Screw for Yamaha FZ Old Series (SKU: 16155-885-297) is a precision-engineered, drop-in replacement component tailored to revitalize classic carbureted engines. Built strictly to original dimensions, this tapered screw meters fuel-to-air induction perfectly during closed-throttle and idling states. Swapping your old, worn-out screw with this calibrated unit ensures smooth cold starts, an ultra-stable idle behavior, and optimized low-RPM power delivery.

❌ Generation Fitment Warning: This air screw configuration is engineered to service first-generation 153cc carbureted powerplants utilizing CV-style mixing platforms only. It is not compatible with FI models Yamaha FZ16 / FZ / FZS (Gen 1), Yamaha FZS Fi / FZ Fi (Version 2.0), Yamaha FZS Fi / FZ Fi (Version 3.0 & V4) & FZ25 (250cc) models)