Mikuni Bds26 Service Manual May 2026

Mikuni BDS26 Service Manual — Overview & Key Content

The Mikuni BDS26 service manual explains maintenance, troubleshooting, and rebuild procedures for the BDS26 carburetor used on small engines and motorcycles. A concise manual typically includes:

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1. Disassembly and Cleaning

According to the manual, start by removing the carburetor from the intake manifold. Do not remove the throttle shaft unless absolutely necessary—it contains tiny, unserviceable bearings. Mikuni BDS26 Service Manual — Overview & Key

Critical step from the manual: 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. Disassembly and Cleaning According to the manual, start

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.