Keihin 108 Main Universal JetRef : IH00137A / 1106193

KEIHIN Main Jet 108 – Manufacturer part number: 99101-357-1080

Main jet size 108 by KEIHIN, designed for carburetor tuning on float-type carburetors. A central element of the fuel circuit, this jet determines the fuel flow at medium and high RPM and allows for fine-tuning the air/fuel mixture for consistent engine behavior under varying conditions.

• Usage: replacement or optimization of the main jet to achieve the correct mixture richness on the main circuit.
• Practical: useful when changing configurations (exhaust, intake), altitude conditions, or for fine-tuning engine response.
• Installation: simple mounting in the carburetor body; respect torque specifications and check for leaks. Monitor spark plug color and perform a road test to validate the adjustment.
• Rider tip: always compare with the original jet and keep the old part for return if necessary. If unsure about the adjustment, entrust the tuning to a specialized workshop.

Original KEIHIN product, ideal for riders concerned with precise carburetor tuning. Check compatibility with your carburetor model before ordering.