
This part being universal, it may require adaptations
KEIHIN Main Jet 138 — Manufacturer reference: 99101-357-1380
This main jet from KEIHIN, size 138, is designed for riders and mechanics looking to fine-tune their carburetor settings. A key component of the fuel circuit, the main jet controls the fuel flow at wide open throttle and directly influences the air-fuel mixture, throttle response, and load behavior.
Ideal for tuning and optimizing the carburetor after modifications to the exhaust, air filtration, or for adapting the fuel mixture to altitude variations, this jet allows you to adjust the richness at full load. Replacement is typically done from the carburetor float bowl; ensure a clean disassembly and have a few basic tools on hand. If you are unsure of the required size for your model, consult a specialist or refer to the manufacturer's documentation.
Product delivered as is, with no additional technical information provided. Check compatibility with your carburetor before ordering.