For a full step-by-step disassembly guide, you can view the Mikuni BS Rebuild Tutorial . How-To: Adjust FLOAT Height & Clear Tube Method

Spray aerosol carburetor cleaner through every internal passage. Confirm that spray exits the corresponding port on the other side.

Use a properly sized screwdriver to avoid stripping the brass. Remove the main jet, pilot jet, and needle seat.

If you are working on a different model, the service manual for that specific motorcycle will be your best source for verified BS26 information. The aftermarket "BS series Operation Manual" on sites like mans.io may provide a more general overview of the BS carburetor family.

(moving it away from the point) lowers the needle, making the mid-range leaner . 5. Troubleshooting Common Issues

| 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 |

Here are the specifications for the Mikuni BS26 carburetor:

Remove all rubber O-rings, gaskets, and diaphragms. Carburetor cleaner will swell and destroy these rubber parts.