Before servicing, correct identification is crucial. The BDS26 is distinct from its siblings (BS26, PD26) due to its mounting angle and specific internal geometry.
What are you experiencing (e.g., hanging idle, leaking fuel, bogs down on acceleration)?
Cause: Debris stuck in the needle valve, a worn rubber needle tip, or a heavy, fuel-logged float. Cause: Clogged pilot jet or a leaking vacuum diaphragm.
Push the emulsion tube out through the top of the carburetor bore (where the slide travels) using a soft wooden dowel.
Precision sizes for removing the pilot and main jets. Fuel Level Gauge or Caliper: For measuring float height. Aerosol Carburetor Cleaner: To dissolve varnish and gum. Compressed Air: For blowing out internal passages. mikuni bds26 service manual
Push the emulsion tube out through the top of the carburetor (where the slide was) after removing the main jet.
The BDS26 has user-adjustable features that allow you to fix rough idling or popping on deceleration.
Drop the clean slide into the dry carburetor body without the spring. It must drop smoothly to the bottom under its own weight without catching.
Provides exploded diagrams and specific jetting for the BDS26 double carburetor setup, available through ATKUSA Before servicing, correct identification is crucial
#90 (Front), #87.5 (Rear) — Note: Jets may differ between front and rear cylinders. Pilot Jet (P.J.): #20 Jet Needle (J.N.): 2nd clip position (Standard)
Spray aerosol carburetor cleaner through every passage, passage mouth, and jet. Ensure fluid exits cleanly from the corresponding exit hole.
Usually caused by a worn needle valve or a piece of debris stuck in the seat.
The is a constant-velocity (CV) downdraft carburetor commonly used on V-twin motorcycles, most notably the Yamaha XV250 Virago (and its V-Star 250 successor) and the Hyosung GV250 . While there is no single standalone "service manual" authored solely by Mikuni for this specific model, comprehensive maintenance data is found within the vehicle-specific service manuals for these motorcycles. Technical Specifications Cause: Debris stuck in the needle valve, a
Standard Phillips heads will strip Mikuni brass screws.
Crucial for blowing out microscopic fuel passages.
If adjustments are needed, carefully bend the small metal tang on the float arm that contacts the needle valve. Jet and Needle Installation