The BS26 relies on five primary overlapping circuits to manage the air-fuel mixture between approximately 1,750 and 4,500 RPM Pilot Circuit: Controls idle and low-speed operation. Throttle Valve (Slide): Regulates air intake via vacuum pressure. Needle Jet & Jet Needle: Manages the mid-range mixture (1/4 to 3/4 throttle). Governs high-speed and wide-open throttle (3/4 to 4/4). Choke Circuit: Provides a rich mixture for cold starts. Critical Maintenance & Tuning
Periodic cleaning is vital as ethanol-blended fuels can clog the tiny orifices of the pilot jet. Mikuni Bs 26 Manual - MCHIP mikuni bs26 carburetor manual verified
Mikuni BS26 Carburetor: The Ultimate Maintenance & Tuning Manual The BS26 relies on five primary overlapping circuits