These settings are for a stock, unmodified engine at sea level.
Reassemble in reverse order, ensuring the diaphragm is seated correctly. 3. Verified Tuning Guide for Mikuni BS26 mikuni bs26 carburetor manual verified
The BS26 uses an air screw on the inlet side of the carburetor body. Turning it leans the idle mixture; turning it in richens it. These settings are for a stock, unmodified engine