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Wide Compatibility This main nozzle is compatible with 4T GY6-139QMB carburetors, ideal for scooters and other motor vehicles such as quads; PERFORMANCE OPTIMIZATION Designed to improve throttle response and ensure efficient combustion by precisely controlling the air-fuel mixture. Reliability and durability: Made from durable materials to ensure a longer service life, even under intensive use or under demanding conditions. CUSTOM ADJUSTMENT With this nozzle, which is available in different sizes, you can adjust the fuel flow to the specific requirements of the engine. EASY INSTALLATION Thanks to the standard dimensions of 4mm, this nozzle is easy to install and compatible with a variety of vehicles.