Mikuni 4/042-230 Carburetor Main Jet Large Hex Type Jets

The Mikuni 4/042-230 is a precision-manufactured main jet designed for use in most Mikuni carburetor models. This large hex-type jet features the traditional six-sided head design that allows for easy installation and removal using standard tools.

Key Features:

• Large hex design for secure installation and easy removal
• Precision-drilled orifice for accurate fuel metering
• Compatible with most Mikuni carburetor applications
• Mikuni part number series 4/042
• Manufactured to OEM specifications for reliable performance

Main jets are critical components in carburetor tuning, controlling the fuel flow at wide-open throttle and high-speed operation. The jet size designation determines the fuel flow rate, allowing you to fine-tune your engine's air-fuel mixture for optimal performance across different altitudes, temperatures, and engine modifications.