K-Jet .120

The K-Jet .120 main pill from Kinsler is a precision brass component engineered for high-performance fuel injection and carburetor tuning applications. This metering jet is essential for racers, performance builders, and fuel system specialists who demand exact fuel delivery control. Designed to work within Kinsler's comprehensive fuel system architecture, the K-Jet .120 allows tuners to optimize air-fuel ratios with confidence, making it a critical component for engine calibration across naturally aspirated and boosted powerplants.

Manufactured from brass for superior corrosion resistance and durability, the K-Jet .120 features a 0.120-inch inside diameter orifice that precisely restricts fuel flow to achieve repeatable metering characteristics. The .120 designation directly indicates the jet's restriction size—a critical specification for calculating fuel curves and ensuring consistent mixture delivery across the RPM band. At just 0.03 pounds and measuring 1.9 x 0.35 x 2.85 inches, this compact main pill integrates seamlessly into existing fuel injection systems while maintaining the structural integrity required for race-duty reliability. Brass construction ensures compatibility with both gasoline and alcohol fuels commonly used in motorsports.

Tuners and engine builders select the K-Jet .120 when baseline fuel mapping requires a balanced restriction that supports mid-range and high-RPM performance. This component is ideal for engine combinations running Kinsler fuel injection systems, where multiple jet sizes allow dial-in precision without expensive custom fabrication. Installation is straightforward—simply thread the main pill into the fuel distribution block and calibrate ignition timing and boost parameters accordingly. Stock in multiple jet sizes to support A/B testing and quick recalibration during dyno sessions or seasonal tune adjustments.