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Remove the vacuum diaphragm and float bowl gasket before spraying carburetor cleaner. The chemicals will cause rubber parts to swell and ruin them.
The original diagram shows the pilot jet screwing into a blind hole. This is wrong. A red circle or arrow connecting the pilot jet cavity to the three small bleed holes downstream of the throttle plate. The patched diagram highlights that fuel must travel horizontally through a tiny drilling that you cannot see without removing the mixture screw.
Carburetor diagrams are essential for understanding the inner workings of the Mikuni BS25. These diagrams provide a visual representation of the carburetor's components, illustrating how they interact to provide optimal engine performance. A well-tuned carburetor is crucial for achieving the perfect air-fuel mixture, which directly impacts engine performance, fuel efficiency, and overall reliability.