Genuine Carburetor Air Screw for Yamaha Ray, Fascino & Alpha – Premium Fuel-Air Idle Mixture Tuning Needle (High-Precision Solid Brass Construction)
Guaranteed Fitment
Product Description
Ultra-Fine Needle Tapering: Tailored to allow precise air-fuel adjustments at low RPMs, ensuring smooth throttle transitions.
Solid Brass Construction: Machined from high-grade brass to resist fuel corrosion and prevent tip blunting during maintenance.
Crisp Thread Geometry: Engineered with precise thread spacing to prevent stripping and ensure the screw holds its position against engine vibrations.
Eliminates Low-End Bogging: Restores clean, consistent fuel delivery to stop low-speed sputtering and traffic signal stalling.
Optimizes Daily Fuel Economy: Allows riders to fine-tune the carburetor to factory specs, maximizing mileage.
Direct Drop-In Fitment: Designed to fit seamlessly into original Mikuni or OEM-spec CV carburetors without modifications.
Stabilize Your Scooter’s Idle and Dial In Perfect Fuel Economy
Riding your gearless automatic scooter with a blunt, corroded, or missing carburetor air screw directly hurts low-end throttle response and fuel economy. Over time, engine vibrations can back the air screw out of its channel, or aggressive adjustment can blunt the delicate needle tip. This prevents the carburetor from regulating fuel at low RPMs. For Yamaha’s popular 113cc automatic scooter platform, a faulty air screw leads to rough idling, constant stalling at traffic lights, and poor fuel economy.
Our premium Carburetor Air Screw Yamaha Ray, Fasino, Alfa (SKU: CASYR1) provides an exact factory-spec solution to restore precise fuel tuning. Machined from solid, high-density brass, it features tight, clean threads that resist stripping under heavy adjust-cycles. The tip is finely tapered to manage the pilot channel's airflow, allowing you to remove flat spots and stalling issues. Replacing a worn factory adjuster with this genuine component stabilizes your engine's idle and optimizes the air-fuel mixture to keep fuel economy high.
❌ Model Exclusion Warning Note: This carburetor adjustment screw is built for early carbureted 113cc engines. It is not compatible with newer Yamaha Fascino 125, Ray ZR 125, or Alpha 125 models, which use modern electronic Fuel Injection (FI) throttle bodies and have no manual air adjustment screws.
Technical Specifications
| Product Component | Carburetor Internal Fuel Hardware / Idle Pilot Air Mixture Screw |
| Manufacturer SKU Reference | Direct Catalog Line Identification: Kalpurze CASYR1 |
| Primary Material Matrix | Heavy-Duty Solid Machined Brass Construction |
| Net Component Mass | Ultra-Lightweight Tuning Design: Approx. 100 Grams (Full Packaging Profile) |
| Thread Matching Metric | Calibrated to drop directly into standard 113cc scooter carburetor bodies |
| Internal Kit Inclusions | 1 Precision Tapered Brass Air Screw Component |
