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: Round-slide throttle configuration (certain OEM variants run an integrated upper vacuum diaphragm assembly). Key Components of a Patched Diagram
If you have installed an open exhaust or pod filter, you may need to increase the main jet size to avoid running too lean. 5. Summary
Soak only the metal castings and brass jets in carburetor cleaner. Keep all rubber diaphragms, O-rings, and plastic floats completely away from harsh solvents, as they will swell and deform. mikuni bs25 carburetor diagram patched
If using a patched BS25 diagram:
While there is no official industry term "patched" for carburetor diagrams, it typically refers to a often shared in enthusiast forums to address common issues like vacuum leaks or "unidentifiable" ports. Key Components of the Mikuni BS25 Summary Soak only the metal castings and brass
Remove the four screws holding the top vacuum cap. Remove the cap, spring, and carefully lift out the slide and rubber diaphragm.
Mikuni BS25 is a Constant Velocity (CV) carburetor commonly used on 150cc engines (like the GY6 150cc) and certain vintage motorcycles. While there is no official "patched" diagram, a "patched" guide typically refers to a visual walkthrough Key Components of the Mikuni BS25 Remove the
: A tapered brass rod hanging directly from the center of the slide. It drops down into the main needle jet nozzle to control gasoline delivery between 1/4 and 3/4 throttle openings.
Vacuum-side corrosion or old gum causes the slide to stick. Cleaning the brass piston guide is essential.
A "patched" diagram will have handwritten notes around the air intake and jetting areas:
The pilot circuit on the BS25 features incredibly narrow internal passages. Patched diagrams feature colored arrows tracing the path of fuel from the bowl, through the pilot jet, past the mixture screw, and out into the bore via tiny transition ports. If your engine idles poorly or stalls when given throttle, these specific highlighted passages are likely clogged with varnish and require targeted aerosol cleaning. Vacuum Leak Hotspots
