Mikuni Bds26 Service Manual Jun 2026

Place the aluminum bodies and brass jets into an ultrasonic cleaner with a 50/50 mix of water and specialized carburetor cleaning solution for 30 minutes at 60°C.

Ensure fluid exits clearly from the corresponding port at the other end of the circuit.

Look for corrosion, varnish buildup, or broken O-rings. Ensure the diaphragms have no cracks, tears, or pinholes. 5. Reassembly & Float Height Adjustment

Note: Brass is soft. Do not overtighten or you will strip the threads. Troubleshooting Common Mikuni BDS26 Issues Probable Cause Corrective Action Stuck float or worn needle valve Clean needle seat or replace float needle Hanging idle / Slow return Lean condition or vacuum leak Check intake boots for cracks; enrich pilot screw Bogging under acceleration Torn slide diaphragm Replace the rubber diaphragm slide assembly Starts only with choke on Clogged pilot jet Remove pilot jet and clear with thin wire or replace mikuni bds26 service manual

Clogged pilot jet or lean pilot screw setting.

Submerge all metal components in an ultrasonic cleaner or carb dip for 30 minutes.

Reattach the carburetor bodies, ensuring springs are placed exactly as they were in your pictures. Place the aluminum bodies and brass jets into

Loosen the drain screw on the bottom of the float bowl to empty residual fuel.

Popping on deceleration can indicate an exhaust leak or a lean pilot circuit condition. Surging or hunting for idle speed often points to an intake air leak or carburetors that need synchronization.

: Use a high-quality JIS #2 screwdriver for the float bowl screws to prevent stripping. Ensure the diaphragms have no cracks, tears, or pinholes

Caused by a stuck diaphragm or incorrect pilot screw setting.

Before beginning work, familiarize yourself with the core layout and factory parameters of the BDS26 system. Technical Specifications Downdraft, Constant Velocity (CV) Bore Size: 26mm

Adjust the synchronization screw until the vacuum reading is identical on both carburetors at idle, usually around . 7. Troubleshooting Common Issues