The Mikuni BS26 is a constant velocity (CV) carburetor widely used in small displacement motorcycles like the Suzuki GN125 and Yamaha XV250. Achieving peak performance requires adhering to verified manual specifications for maintenance and tuning. Understanding the Mikuni BS26 System
: Adjust the idle screw to achieve the manufacturer's target RPM (typically found in your specific vehicle's service manual). Choke (Enricher) System : Ensure there is 1/16" to 1/8" of slack mikuni bs26 carburetor manual verified
These verified factory specs provide the baseline for maintenance and tuning: Venturi Diameter : Typically 100–120 (varies by application) : 17.5–25 Needle & Seat : 2.5mm seat / 5.0mm needle stem Float Height : 24mm (Standard for many BS series units) Fuel Requirement : Minimum 87 Octane Petrol Adjustment & Tuning Procedures The Mikuni BS26 is a constant velocity (CV)
Diaphragm inspection:
Correct method (per Mikuni manual):