Mikuni Bs26 Carburetor Manual Verified [hot] 【Recent】
| Specification | Verified Value | Notes | | :--- | :--- | :--- | | | #127.5 (Left) / #130 (Right) | GS500 only. Singles use #125. | | Pilot Jet | #40 | (Some models use #37.5 – check your needle) | | Pilot Air Screw | 2.5 to 3.0 turns out | From fully seated. Do not exceed 4 turns. | | Float Height | 13.0 mm (13.7 mm for GN250) | Measure with carb inverted, float tang just touching needle spring. | | Needle Clip Position | 4th groove from top | (Standard is middle, but GS500 uses richer 4th) | | Idle Speed | 1,200 RPM (+/- 100) | Must be set when engine is fully hot. | | Diaphragm Part # | 13258-02C00 | (OEM Mikuni – Aftermarket fails quickly) | | Float Bowl Gasket | 13269-01A00 | Not reusable after soaking in cleaner. |
The pilot mixture screw controls fuel flow. Turning it out (counter-clockwise) richens the mixture; turning it in leans the mixture.
For further assistance or more detailed information, consult the following resources: mikuni bs26 carburetor manual verified
1.5 to 2.25 turns out from lightly seated
If you need to go beyond this guide, refer to the official – the BS26 section matches all data above. | Specification | Verified Value | Notes |
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.
Remove the main jet, pilot jet, and emulsion tube. Clean them with specialized carburetor cleaner, ensuring all tiny orifices are clear. Tuning and Troubleshooting Tuning should follow a specific sequence: the Idle Circuit (pilot jet/screw), followed by the Main Circuit (main jet), and finally the (needle position). DCC Presents: A Guide to Mikuni Carbs Do not exceed 4 turns
Located next to the main jet inside a recessed well. It manages fuel delivery from idle up to 1/4 throttle. 3. The Float Chamber Assembly
