+---------------------------------------+ | Air Filter | +---------------------------------------+ | | v +---------------------------------------+ | Venturi | | (throat) | +---------------------------------------+ | | v +---------------------------------------+ | Main Jet | Pilot Jet | Needle | | (fuel) | (idle) | Valve | +---------------------------------------+ | | v +---------------------------------------+ | Float Bowl | | (fuel storage) | +---------------------------------------+
In short, an online forum post containing a "patched" Mikuni BS25 diagram is a community-vetted, "best known" configuration. It is a roadmap built from collective experience.
Controls fuel flow at idle and up to 1/4 throttle. It has very small holes that clog easily.
The vacuum diaphragm is torn, or the jet needle clip is in the wrong position.
Start by turning it in until lightly seated, then back it out 1.5 to 2.5 turns.
+---------------------------------------+ | Air Filter | +---------------------------------------+ | | v +---------------------------------------+ | Venturi | | (throat) | +---------------------------------------+ | | v +---------------------------------------+ | Main Jet | Pilot Jet | Needle | | (fuel) | (idle) | Valve | +---------------------------------------+ | | v +---------------------------------------+ | Float Bowl | | (fuel storage) | +---------------------------------------+
In short, an online forum post containing a "patched" Mikuni BS25 diagram is a community-vetted, "best known" configuration. It is a roadmap built from collective experience.
Controls fuel flow at idle and up to 1/4 throttle. It has very small holes that clog easily.
The vacuum diaphragm is torn, or the jet needle clip is in the wrong position.
Start by turning it in until lightly seated, then back it out 1.5 to 2.5 turns.
