: Start with the pilot (mixture) screw at 1.5 to 2 turns out from lightly seated.
The Mikuni BS26 carburetor is a popular and highly-regarded carburetor used on a variety of motorcycles, scooters, and other small engines. Known for its reliability and performance, the BS26 has become a favorite among enthusiasts and mechanics alike. In this article, we'll provide a comprehensive manual for the Mikuni BS26 carburetor, including specifications, troubleshooting tips, and maintenance procedures.
The following is a verified guide to adjusting, maintaining, and repairing the Mikuni BS26 carburetor:
To verify and validate the information provided in this manual, we have consulted the following sources:
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
Standard sizes range from #110 to #130 depending on the OEM application. Pilot Jet: Usually a #15 or #22.5.
It automatically compensates for changes in engine load and atmospheric pressure.
Specifications:
Readjust your idle speed screw to return the engine to its factory idle RPM. Fine-Tuning the Mid-Range