Mikuni Bs25 Carburetor Diagram Patched [extra Quality] Jun 2026

| Symptom | Unpatched Diagram Diagnosis | Patched Diagram Diagnosis | | :--- | :--- | :--- | | | Replace float needle | Replace the hidden o-ring behind the seat (patch #2) | | No idle | Clean pilot jet | Clean the horizontal passage between pilot jet and mixture screw (patch #1) | | Bogs at half-throttle | Replace diaphragm | Check diaphragm tab alignment and spring placement (patch #4) | | Mixture screw does nothing | Unscrew further | Drill out the brass anti-tamper plug (patch #3) |

: When the throttle is wide open, the main jet size acts as the restrictive bottleneck controlling total fuel delivery. Step-by-Step Rebuilding and Maintenance Roadmap BS Carburetors - Mikuni Power mikuni bs25 carburetor diagram patched

Controls idling and low-speed fuel (up to 1/4 throttle). Float Assembly: Meters fuel level within the bowl. | Symptom | Unpatched Diagram Diagnosis | Patched

Controls fuel delivery from roughly 1/4 to 3/4 throttle. Controls fuel delivery from roughly 1/4 to 3/4 throttle