Genuine Carburetor Slide With PIN Diaphragm for Yamaha Ray, Ray Z, Fascino & Alfa – Premium Internal Fuel Vacuum Piston Assembly (High-Grade Brass Jet Needle & Nitrile Rubber)

Integrated Drop-In Assembly: Features a pre-assembled combination of the vacuum slide piston, metering needle pin, and rubber membrane for a simple installation process.

Premium Fuel-Resistant Elastomer: Engineered from a highly flexible rubber compound that resists swelling, cracking, and thinning when exposed to modern ethanol petrol blends.

Ultra-Lightweight Aluminum Piston Slide: Machine-finished body allows friction-free vertical travel inside the carburetor chamber, eliminating sticky throttle behavior.

Precision-Profiled Brass Metering Pin: Delivers accurate fuel delivery ratios throughout the entire mid-to-high RPM acceleration curve.

Instant Vacuum Sensitivity: Designed to react immediately to engine pressure variations, ensuring crisp throttle response from low speeds.

Cost-Efficient Restoration Spares: Allows you to fix vacuum leaks and worn components directly instead of paying for a full-unit carburetor replacement.

Eradicate Throttle Hesitation and Restore Smooth Engine Accel Cycles

Riding your gearless automatic scooter with a worn-out, pinholed, or stiffened carburetor diaphragm causes an immediate drop in ride quality. Constant exposure to modern ethanol-blended fuels and intense engine compartment temperatures causes the fine internal rubber membrane to lose its flexibility, tear, or develop micro-punctures. When this happens, your carburetor loses its ability to hold a stable internal vacuum, preventing the throttle slide piston from lifting properly when you twist the throttle. Across Yamaha’s signature 113cc engine platform—powering models like the Ray, Ray Z, Alpha, and Fascino—a failing diaphragm results in severe throttle hesitation, mid-range dead spots, poor fuel-air ratios, and an inability to hit top speeds.

Our premium Carburator Slide With PIN Diaphragm Yamaha RAY, Ray Z, Facino, Alfa (SKU. - CSPDYRZ1) provides a precise, factory-calibrated repair solution designed to restore smooth, progressive acceleration without requiring an entire new carburetor assembly. This integrated unit includes a lightweight, ultra-smooth aluminum slide piston, a factory-set brass jet needle (pin), and an exceptionally flexible, fuel-resistant rubber diaphragm. The entire sub-assembly is built to match original equipment dimensions perfectly, ensuring instant pressure response to vacuum changes. Replacing a degraded component with this genuine kit completely resolves flat spots during acceleration, stabilizes high-speed cruising, and brings back the responsive engine pick-up your scooter had on day one.