Governs the mid-range fuel flow (1/4 to 3/4 throttle).
The Mikuni BS26 carburetor features a range of jetting options to suit various engine applications. The following jetting guide provides a general starting point for tuning:
The Mikuni BS26 carburetor is a reliable and high-performance carburetor that requires regular maintenance to achieve optimal performance. By following the specifications, troubleshooting tips, and maintenance procedures outlined in this manual, you should be able to keep your BS26 carburetor running smoothly and efficiently. mikuni bs26 carburetor manual verified
The pilot jet has a very tiny hole that clogs easily. Use carburetor cleaner and compressed air.
Fix: Inspect mounting boots for cracks and verify the pilot jet pathway is clear. Governs the mid-range fuel flow (1/4 to 3/4 throttle)
| Parameter | Spec | |-----------|------| | | Constant Velocity (CV), downdraft | | Bore size | 26 mm | | Venturi diameter | 24.5 mm (effective) | | Fuel inlet | 5/16" (8mm) barb | | Float bowl gasket | Rubber (O-ring type) | | Pilot air jet | 120–130 (varies by model) | | Main air jet | 180–200 | | Idle speed | 1,200–1,300 RPM |
Setting the float height is critical to prevent flooding or lean conditions. Fix: Inspect mounting boots for cracks and verify
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5D-series (Clip typically non-adjustable on stock EPA models)
Flip the carburetor over and remove the four bowl screws. Lift the bowl off gently to avoid damaging the gasket.