SKU:35-3919
The Ultima Keihin Carburetor Pilot Jet is designed to support precise low-speed fuel metering in compatible Keihin carburetors. With a calibrated orifice of .58mm, approximately .023 inch, this pilot jet helps regulate the fuel supply through the pilot circuit during starting, idling, and low-throttle operation. It is a practical replacement component for carburetor service, tuning, and restoration applications where accurate pilot-circuit performance is required.
The Ultima pilot jet is manufactured for use with compatible Keihin carburetor assemblies and is identified by Part Number 39-199. Its compact design allows it to install within the carburetor’s pilot circuit using standard service procedures and appropriate tools. Before ordering or installation, compare the part number, jet specification, and carburetor application to confirm compatibility with the equipment being serviced.
This carburetor pilot jet is supplied as one individual piece and is measured in millimeters for precise fuel-system tuning. Proper installation and a clean carburetor passage are important for achieving consistent performance. A blocked, worn, or incorrectly sized pilot jet can contribute to difficult starting, unstable idle, hesitation, or poor low-speed response, making replacement an important part of routine carburetor maintenance. Ultima Part Number 39-199 provides a clearly identified service option for compatible Keihin applications.
Made in the USA, this pilot jet is supplied with a unit of measure of each. Use it as a replacement during carburetor rebuilding, preventive maintenance, or calibration work. Always follow the carburetor manufacturer’s service instructions and verify fuel-system settings after installation. The Ultima brand and 39-199 part number make identification straightforward when organizing replacement components or matching a service list.
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