Mikuni Bds26 Service Manual -
Flip the carburetor upside down. Remove the four screws holding the float bowl.
Adjust the pilot mixture screw slowly inward until the idle drops, then turn it outward until the engine stumbles. Fix the screw directly in the middle of these two points (usually around 2.25 turns out). Symptom Troubleshooting Matrix
The gold standard for deep cleaning. Step 1: Disassembly
Readjust the master idle speed screw if the idle speed has climbed out of specification. Carburetor Synchronization (For Twin-Cylinder Setups)
Turn the pilot mixture screw clockwise while counting the exact number of half-turns until it seats gently. mikuni bds26 service manual
Unscrew the four Phillips screws. Be careful not to strip them, as they are often soft brass or zinc.
Inspect the rubber diaphragm for pinholes by holding it up to a strong light source. 2. Disassembling the Float Bowl Flip the carburetor upside down. Remove the four bowl screws.
Understanding the operation is vital for diagnostics:
Soak heavily varnished brass parts in carburetor cleaning solvent for 30 minutes. Flip the carburetor upside down
Gently turn the pilot screw in until it seats, then back it out to the factory starting point (usually 2.0 to 2.5 turns). Step 5: Sync and Fine Tuning Once the carburetors are back on the bike:
Modern ethanol fuel leaves green/white crusty deposits that block the tiny passages.
For an in-depth, specific rebuild, refer to the Mikuni PHH Service Manual for general principles and specialized Mikuni Resources for jetting information.
For precise float height verification.
The BDS26 features a 26mm bore and relies on a vacuum-operated diaphragm to lift the slide, ensuring consistent air velocity.
Because of this, the official "service manual" is usually embedded within the specific motorcycle's workshop manual (e.g., the Suzuki GS125 or Hyosung GV125 service manual) rather than existing as a standalone Mikuni document.
Drop the jet needle into the slide, lock it with the retainer, and lower the slide assembly into the body.