Mikuni Bs26 Carburetor Manual Verified [upd] Page

| | Main Jet | Pilot Jet | Needle Jet | Pilot Air Screw (turns out) | Float Height | | :--- | :--- | :--- | :--- | :--- | :--- | | BS26-49 | 107.5 | 42.5 | 4DX8-3 | 2-3 turns (±?) | 21.4 mm | | BS26-61 | 107.5 | 42.5 | 4DX8-4 | 2-3 turns (±?) | 21.4 mm |

: For many similar carburetors, a dry float height specification ranges from 6.2 mm to 8.2 mm . However, this can vary, so always verify with a service manual for your bike.

As air rushes through the venturi, it creates a pressure drop (vacuum) above the rubber diaphragm. mikuni bs26 carburetor manual verified

Clear with aerosol cleaner and compressed air. Never use wire. Cracks or bent mounting tabs Replace carburetor body if structural damage exists. Throttle Shaft Side-to-side play or worn seals Replace shaft seals to prevent unmetered air leaks. 5. Reassembly and Float Height Adjustment

The four Philips-head screws securing the vacuum diaphragm cover are notoriously tight. To avoid stripping them: | | Main Jet | Pilot Jet |

Controls airflow via physical cable connection.

Align the alignment tab on the outer perimeter of the vacuum diaphragm with the matching indentation on the top rim of the carburetor body. If it is misaligned, the slide will bind. 6. Tuning and Troubleshooting Clear with aerosol cleaner and compressed air

Ensure the rubber tip of the float needle is supple and hasn't developed a "ring" or groove, which causes overflowing. 4. Tuning & Adjustments (The Verified Way) The Pilot Screw (Idle Mixture)

Use aerosol carb cleaner and compressed air, ensuring all passage holes are clear.

Before you begin, ensure you have a clean, well-lit workspace. A digital camera is an invaluable tool—take clear, detailed photos at every step of disassembly to ensure correct reassembly. Work on a large, clean mat to prevent losing small components like springs, washers, and tiny O-rings.