Mikuni 4/042-50 Carburetor Main Jet Large Hex Type Jets

The Mikuni 4/042-50 is a precision-engineered carburetor main jet designed for optimal fuel metering in powersports applications. This large hex-style jet features the universal 4/042 configuration used across most Mikuni carburetor models.

Key Features:

• Large hex head design for easy installation and removal
• Size 50 jet orifice for precise fuel flow control
• Compatible with most Mikuni carburetors including VM, TM, and HSR series
• Manufactured to exact OEM specifications for reliable performance
• Brass construction for durability and corrosion resistance

Main jets control the fuel mixture at mid to wide-open throttle positions, making proper jet sizing critical for engine performance and reliability. The 4/042 series jets are widely used in motorcycle, ATV, UTV, and other powersports carburetor applications. Jets are sized numerically, with higher numbers indicating larger orifice diameters and increased fuel flow.