Mikuni 4/042-320 Main Jet Large Hex Carburetor Metering Jet Jets

The Mikuni 4/042-320 is a large hex-style main jet designed for precise fuel metering in Mikuni carburetors. This jet features the standard large hexagonal head design that is compatible with most Mikuni carburetor models, making it a versatile replacement or tuning component.

Key Features:

• Large hex head design for easy installation and removal
• Precision-drilled orifice for accurate fuel flow control
• Compatible with most Mikuni carburetor applications
• High-quality brass construction for durability and corrosion resistance
• Part of the Mikuni 4/042 series jet family

Main jets are essential for carburetor tuning, controlling the fuel mixture at mid to wide-open throttle positions. The jet size directly affects engine performance, fuel economy, and throttle response. When re-jetting your carburetor for performance modifications, altitude changes, or seasonal tuning, always ensure you select the correct jet size for your specific application.