Ultima 39-201 Keihin Carburetor Pilot Jet, 0.62 mm

The Ultima 39-201 Keihin carburetor pilot jet is a precision replacement component designed to support accurate low-speed fuel delivery in compatible Keihin carburetor applications. With a calibrated 0.62 mm orifice, this pilot jet helps regulate the fuel circuit used during starting, idling, and initial throttle operation. Its precise sizing makes it a practical choice when restoring proper carburetor performance or replacing a worn, damaged, or incorrectly sized jet. The compact design is intended for installation in compatible Keihin carburetor assemblies using the corresponding pilot jet specification.

Proper pilot jet selection is essential for maintaining consistent idle quality, smooth throttle response, and dependable engine operation. The Ultima 39-201 is manufactured for reliable service and can be used during carburetor maintenance, tuning, or repair procedures. Always compare the original jet specification and verify carburetor compatibility before installation, as fuel system requirements may vary by engine configuration, intake components, exhaust modifications, altitude, and other operating conditions. This component is supplied as one individual piece, with a unit of measure of each, and is made in the USA.

Features:

• Brand: Ultima

• Part Number: 39-201

• Application: Keihin carburetor pilot jet replacement

• Orifice Size: 0.62 mm, approximately 0.024 inch

• Function: Helps regulate fuel delivery during starting, idling, and initial throttle operation

• Use: Suitable for carburetor maintenance, tuning, and repair when the specified jet size is required

• Unit of Measure: Each

• Country of Origin: USA

• Accessory Items: None