Mikuni Bs26 Carburetor Manual Verified Fix May 2026

By using the outlined in this article—float height of 13.0mm, pilot screw at 2.5 turns, legitimate OEM diaphragms, and a stock air box—your BS26 will start on the first choke pull in freezing weather and idle like a sewing machine.

If you own a late-80s to early-2000s Suzuki GS500, GN250, or GZ250, you have almost certainly cursed the name of the Mikuni BS26 —or perhaps you’ve praised its reliability. The truth is, this constant velocity (CV) carburetor is a masterpiece of emissions-era engineering when it works correctly. But when it fails? It becomes a ticking time bomb of hesitation, flat spots, and sticky slides. mikuni bs26 carburetor manual verified

Because the BS26 is a CV carb, it requires a still air box to create the correct pressure signal over the diaphragm bleed hole. If you remove the air box and install foam pods, you create turbulence that confuses the slide. By using the outlined in this article—float height of 13

Need a specific torque value or jet size for your exact year and model? Leave a comment below with your bike’s VIN prefix, and we will pull the verified page from the factory manual. But when it fails