Keihin NJT00457 Jet Needle 48 Series DCE

The Keihin NJT00457 is a precision-engineered jet needle designed for fine-tuning carburetor performance across the critical mid-range throttle position. This 48 Series jet needle features the DCE profile designation, which determines the needle's diameter, taper angle, and length characteristics that control fuel metering from approximately 1/4 to 3/4 throttle opening.

Key Features:

• OEM Keihin part number N427-48DCA for guaranteed quality and precise specifications
• Controls fuel delivery in the most critical throttle range where engines spend the majority of operating time
• Compatible with multiple Keihin carburetor models: PE 36mm, PJ 34-38mm, PWK 33-41mm, and PWM 38mm
• Precision-manufactured to exact tolerances for consistent jetting performance
• Adjustable via clip position grooves for fine-tuning mixture richness

The jet needle is widely considered the most important tuning component in Keihin slide-valve carburetors, affecting throttle response, power delivery, and engine reliability. The DCE profile designation indicates specific dimensions for the straight diameter section, taper angle, and overall length. Proper jet needle selection is crucial for achieving optimal air-fuel ratios throughout the midrange, preventing lean conditions that can cause engine damage and rich conditions that reduce performance.

This genuine Keihin jet needle ensures proper fitment and performance in compatible PE, PJ, PWK, and PWM series carburetors commonly found on motorcycles, ATVs, and other powersports applications.