Mikuni Bds26 Service Manual [updated]

Remove the top cap (4 screws). Carefully lift out the vacuum piston/diaphragm assembly. Do not use solvent on the diaphragm. Use only soapy water. Soak the metal body in carb cleaner for 4 hours, but remove all rubber first. 2. Inspecting the Diaphragm Hold the diaphragm up to a light. Any pinholes or cracking means replacement. The manual includes a “stretch test” – the diaphragm should return to flat within 2 seconds after being folded. 3. Setting the Float Height The BDS26 manual shows an inverted carburetor method. With the gasket in place, measure from the float bowl mating surface to the highest point of the float. Spec: 15mm ± 1mm . Bend the float tang carefully. Incorrect float height is the #1 cause of flooding on the BDS26. 4. Jetting Chart Reference A typical page in the BDS26 service manual will list:

| Temperature | Altitude | Main Jet | Pilot Jet | Air Screw (turns out) | |-------------|----------|----------|-----------|------------------------| | -10°C to 0°C | 0-3000ft | 135 | 25 | 1.75 | | 0°C to 10°C | 3000-6000ft | 130 | 22.5 | 2.0 | | 10°C+ | 6000ft+ | 125 | 20 | 2.25 | mikuni bds26 service manual

The is more than a paperweight—it is a precision tool. It provides the tolerances, jetting data, and vacuum circuit maps that no YouTube tutorial can fully replace. Bookmark a reliable PDF source, print the critical pages (float height, jetting chart, exploded view), and keep them in your shop. Remove the top cap (4 screws)