The Keihin Carburetor Pilot Jet N424-21 #45 4/PK WPS # 144-2145 is a high-quality performance part made of brass specifically designed for motorcycle and scooter engines. This product is a set of four jets that are crucial for fuel delivery and ensuring optimal engine performance. The OE/OEM part number 144-2145 ensures compatibility with various models, making it a reliable choice for motorcycle enthusiasts looking to enhance their air intake and fuel delivery system.