This article provides a comprehensive guide on how to tune a carburetor, applicable to any Honda bike equipped with a throttle wire actuated slide, including models like the Honda CD70, Pridor, and Honda CG125.
Let's start from the basics:
A carburetor operates based on the venturi principle. During the engine's intake stroke, air passes through a venturi in the carburetor, creating a low-pressure area. Within this venturi, a fuel jet is positioned. As air flows through the venturi, the low pressure causes fuel to be drawn through the fuel jet. The fuel then mixes with air and becomes atomized for combustion. The carburetor typically contains three air-fuel circuits from which the air-fuel mixture is supplied.
1: idle jet
2: needle jet
3: main jet
1:idle jet: The idle jet in a carburetor is responsible for regulating the fuel flow during idle and influences engine performance from idle to approximately 25% throttle position.
2: needle jetThe needle in the carburetor, typically attached to a slide or piston, controls the fuel supply from approximately 25% to 75% throttle position.
3: Main Jet: It supplies fuel from 75% to full throttle position.
It supplies fuel from 75% to full throttle position.
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