Mikuni Bs26 Carburetor Manual Verified [top] ★

The Mikuni BS26 is a 26mm constant velocity carburetor, common on small-displacement motorcycles and ATVs, featuring a 24mm float height and a pilot screw setting of 1.5 to 1.75 turns out. Proper maintenance requires cleaning the pilot jet to prevent idle issues, inspecting the diaphragm for tears, and setting the float height precisely to avoid overflow. For comprehensive documentation and diagrams, refer to scribd.com

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Installation and Adjustment

| Specification | Verified Value | Notes | | :--- | :--- | :--- | | Main Jet | #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. | mikuni bs26 carburetor manual verified