Carburetor Diagram Patched Best — Mikuni Bs25

The Mikuni BS25 is a Constant Velocity (CV) carburetor commonly used on vehicles like the Yerf Dog Scout, Rover, and some Yamaha motorcycles (such as the YBR 125). Unlike standard round-slide carbs, it uses a vacuum diaphragm to lift the slide, smoothing out throttle response. Key Components of the Mikuni BS25

The factory manuals for the BS25 were notoriously vague about the transition circuit. Frustrated, Silas had reached out to an old-timer in an online forum who went by the handle JetStream. Two days later, a scanned image arrived in Silas’s inbox. It was a factory diagram, but someone had gone over it with a fine-tipped pen. This was the "patched" diagram. mikuni bs25 carburetor diagram patched

• Do not patch. Order a repair kit (Mikuni part # N424-37 series) or a generic BS25 slide assembly.

When tuning or modifying your Mikuni BS25 carburetor, keep in mind: The Mikuni BS25 is a Constant Velocity (CV)

out exactly two-and-a-half turns, just as the faded ink on the diagram commanded [4, 6]. Do not patch