This 87.5 OEM Adly main jet is a carburetor main jet used to increase fuel flow at mid- to high-RPM speeds, as per the Carburetor section of the Adly OEM diagram.
The 87.5 size corresponds to the bore diameter calibrated by Adly, allowing for a richer mixture than a smaller jet, which is necessary in certain engine configurations requiring more fuel.
The main jet operates primarily when the throttle valve is wide open, interacting directly with:
the needle nozzle
the needle set
the carburetor main circuit.
16108-104-000
