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The BDS26 has very narrow passages that clog easily with old, "varnished" fuel.
Incorrect float height causes either engine flooding (too high fuel level) or high-RPM fuel starvation (too low fuel level).
Mikuni BDS26 is a constant velocity (CV) carburetor frequently found on motorcycles like the Yamaha XJ600 Seca II Virago 250 Hyosung GV250
Turn the pilot mixture screw inward slowly until engine RPM drops. mikuni bds26 service manual
Carefully pull the rubber vacuum diaphragm and slide assembly straight up out of the carburetor body.
The manual provides a specific (attach a clear vinyl tube to the bowl drain, open drain screw, measure fuel level relative to bowl mating surface: 9–10 mm below).
Install new pilot and main jets if your rebuild kit includes them. The BDS26 has very narrow passages that clog
Soak heavily varnished brass parts in carburetor cleaning solvent for 30 minutes.
The Mikuni BDS26 is a 26mm downdraft, constant velocity (CV) carburetor renowned for its reliability and smooth throttle response. It served as the standard fuel system on a wide range of popular small-displacement motorcycles throughout the 1980s, 1990s, and 2000s.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Guide to Rebuild Mikuni BDST Carburetors - LiteTek Carefully pull the rubber vacuum diaphragm and slide
Usually a vacuum leak, worn diaphragms, or incorrect synchronization. Where to Find Genuine Parts & Manuals
This comprehensive service manual provides the step-by-step procedures, technical specifications, and tuning insights required to completely overhaul your Mikuni BDS26 carburetor. Technical Specifications & Component Blueprint
Tap the side of the bowl gently with a plastic mallet if the gasket is stuck. Lift the bowl straight off.
Before beginning a service, it is crucial to understand the components of your specific carburetor set: Mikuni BDS26 Go to product viewer dialog for this item. (Dual Setup) Bore Size: 26mm Main Jet: Varies by model (e.g., #95, #100) Pilot Jet (Slow Jet): Typically #15 or #17.5 Needle Jet/Jet Needle: Controls mid-range fuel delivery
