Japanese Industrial Standard tips prevent stripping Mikuni screws.
Use a dedicated carburetor cleaner. Avoid getting cleaner on rubber parts (diaphragms/O-rings), as it will cause them to swell and ruin them.
use welding tip cleaners or steel wire to clear jet holes; steel alters the precise calibration of soft brass orifices. Use compressed air instead. Component Inspection Checklist
Work in a clean, well-lit area. Layout parts on a lint-free shop towel. 1. Removing the Diaphragm and Slide Remove the top chrome or plastic cap screws. mikuni bds26 service manual
Use a high-quality flathead screwdriver to remove the pilot jet and main jet. Cleaning:
Use your calipers to measure the distance from the gasket mating surface (with the rubber gasket removed) to the highest point of the float profile. The measurement must fall between .
Because these carburetors are no longer in production, a service manual is your lifeline for keeping your machine running. use welding tip cleaners or steel wire to
Note: As per the fuel system maintenance , always shut off the fuel cock and disconnect the fuel hoses. 4. Disassembly and Cleaning Procedure
Lift away the float assembly along with the needle valve (float needle).
Unlike traditional slide carburetors, the BDS26 utilizes a vacuum-operated diaphragm to control the slide position. This design offers smoother throttle response, better fuel economy, and reduced emissions, but it requires specific maintenance procedures different from those of manual-slide carburetors. This document outlines identification, disassembly, inspection, reassembly, and tuning protocols. Layout parts on a lint-free shop towel
Carburetor cleaning involves flammable solvents and tiny components. Prepare your workspace properly.
Proper cleaning is the most important part of the service manual process.
Let’s extract the core service procedures directly from a typical Mikuni BDS26 service manual. These steps assume you have the manual’s torque and measurement tables in front of you.
Gently turn the pilot screw clockwise until it stops, then back it out 2.5–3 turns. 6. Tuning and Troubleshooting