SKU:35-3918
The Ultima 39-198 Keihin carburetor pilot jet is designed to support accurate low-speed fuel metering in compatible Keihin carburetor applications. With a calibrated orifice measuring 0.56 mm, approximately 0.022 inch, this pilot jet helps regulate the fuel mixture during starting, idling, and initial throttle operation. It is a practical replacement component for restoring proper carburetor performance when the original jet is worn, damaged, clogged, or otherwise unsuitable for continued use.
The compact jet is manufactured for use with compatible Keihin carburetor assemblies and is intended to match applications requiring this specific pilot-jet size. Correct jet selection is essential for maintaining the intended air-fuel ratio, throttle response, and idle quality. Before installation, compare the existing component with the Ultima 39-198 part number and verify that the carburetor manufacturer, jet style, and calibrated opening are appropriate for the application. Carburetor settings may also be affected by engine configuration, intake components, exhaust changes, altitude, and other tuning factors.
Installation should be performed with clean tools and a contamination-free work area. Remove deposits carefully and avoid enlarging or deforming the calibrated opening, as changes to the orifice can alter fuel delivery. Use appropriate carburetor-safe cleaning methods and tighten the jet according to the carburetor manufacturer’s service recommendations. After installation, inspect for secure seating, confirm that the passages are clear, and adjust the carburetor as required for stable idle and responsive operation. The Ultima 39-198 pilot jet is supplied as an individual component and has a unit of measure of each. It is made in the USA and provides a dependable replacement option for compatible Keihin carburetor systems.
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