Mikuni Bs26 Carburetor Manual Verified Jun 2026

Turn the carburetor upside down and remove the float bowl screws. If the screws are seized, use an impact screwdriver to avoid stripping the soft JIS (Japanese Industrial Standard) heads.

The following diagrams and illustrations are provided to help with the understanding of the Mikuni BS26 carburetor:

Carefully lift the cover, noting that the diaphragm spring will push upward. mikuni bs26 carburetor manual verified

Proper tuning requires the engine to be at operating temperature and the bike to be upright. Pilot (Air/Fuel) Screw Initial Setting : Start at 2 to 2.5 turns out from lightly bottomed. Fine Tuning

The rubber diaphragm creates a seal; engine vacuum lifts the slide to regulate airflow. Turn the carburetor upside down and remove the

Constant velocity carburetors use pressure differentials to regulate airflow. Unlike direct-pull carburetors, your throttle cable does not lift the slide.

Turn the carburetor over and remove the four float bowl screws. Lift the bowl straight up to avoid damaging the float. Proper tuning requires the engine to be at

Turn the idle mixture screw clockwise until the engine stumbles. Turn it counter-clockwise until it stumbles again. The optimal setting is the midpoint between these two points (highest idle RPM). 2.2 Adjusting the Needle Position

Disconnect the throttle cable, choke cable (or enricher wire), fuel line, and vacuum lines. Loosen the intake boot clamps and pull the carburetor free.

Attached to the diaphragm. They lift automatically as engine load increases.