The Mikuni BDS26 is a specialized, dual-throat, constant velocity (CV) carburetor, most famously associated with Harley-Davidson Evolution (Evo) Big Twins from the late 1980s through the 1990s (e.g., FXRs, Softails, Dynas). Unlike the more common single-throat CV40 or CV44, the BDS26 uses two separate 26mm venturis fed by a shared fuel bowl, acting effectively as two carburetors in one casting.
Note: Float height measurement for the XJ600 is taken from the gasket surface to the top of the float while it is just touching the needle but not compressing the spring. Rebuild and Service Steps Mikuni BDS26 Carburetor Specifications | PDF - Scribd
Proper float height is critical to prevent overflowing or fuel starvation. mikuni bds26 service manual
Float Height: Often set at 13.5mm to 14.5mm (measured from the gasket surface to the top of the float while the needle is seated but not compressed).
The Mikuni BDS26 carburetor is a popular model used on various vehicles, including motorcycles, ATVs, and UTVs. Regular maintenance and repair of the carburetor are essential to ensure optimal performance, fuel efficiency, and engine longevity. This guide provides a step-by-step approach to servicing and repairing the Mikuni BDS26 carburetor. The Mikuni BDS26 Service Manual: A Deep Technical
While specific tuning depends on the exact bike model, the "factory" baseline for a Mikuni BDS26 on a standard 250cc cruiser is generally:
They are handed due to the offset needle jet. Reverse installation causes the needle to bind. Note: Float height measurement for the XJ600 is
Clear Passageways: Use compressed air or aerosol Carb Cleaner to ensure all tiny orifices, especially the pilot circuit, are completely clear . 2. Float Height Adjustment
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