The Mikuni BS26 is a 26mm constant velocity carburetor, common on small-displacement motorcycles and ATVs, featuring a 24mm float height and a pilot screw setting of 1.5 to 1.75 turns out. Proper maintenance requires cleaning the pilot jet to prevent idle issues, inspecting the diaphragm for tears, and setting the float height precisely to avoid overflow. For comprehensive documentation and diagrams, refer to scribd.com
Hold the rubber diaphragm up to a bright light. Gently stretch the edges. If you spot any pinholes, light leaks, or cracks, the diaphragm must be replaced. A damaged diaphragm cannot hold vacuum, preventing the slide from lifting and killing top-end power. 5. Tuning and Jetting Adjustments mikuni bs26 carburetor manual verified
Start the engine and let it reach full operating temperature. The Mikuni BS26 is a 26mm constant velocity
The pilot screw regulates the air-fuel mixture at idle and off-idle throttle positions. Gently stretch the edges
Remove the two or three screws securing the top chrome or black plastic cap.
4.0mm to 5.0mm below the carburetor mixing chamber body joint Component Anatomy and Identification