Locate the brass pin holding the float hinge. Slide the pin out to release the float assembly and the attached float needle valve. Unscrew the main jet from the center emulsion tube. Unscrew the pilot jet, which sits recessed inside a narrow tunnel. 4. Pilot Screw Removal
| Modification | Required change | Jet size change | |--------------|----------------|------------------| | Pod filter (no airbox) | Impossible to tune well – BS26 needs airbox restriction | +2 on main jet, raise needle 1 clip, pilot +2 sizes – but still runs poorly | | High-flow exhaust | Usually none | Only if popping on decel → +1 on pilot jet | | High altitude (>2,000m) | Drop main jet by 1 size per 1,000m | Example: #100 → #95 | mikuni bs26 carburetor manual verified