Connected directly to your throttle cable. It opens to allow air into the engine, creating the vacuum that lifts the slide.
| Patch Type | Diagram Marking | Purpose | |------------|----------------|---------| | | Red circle around pilot jet | Replacement with larger jet (e.g., #42.5 → #45) | | Drilled passage | Dashed line added | Enlarging air bleed hole for richer idle | | Gasket repair | Cross-hatched area | Silicone or paper gasket patch for vacuum leak | mikuni bs25 carburetor diagram patched
The BS25 has a small barbed fitting for the fuel petcock (auto fuel valve). Connected directly to your throttle cable
The is a round-slide, constant velocity (CV) carburetor commonly found on mid-sized 150cc 4-stroke engines, such as those in GY6-equipped vehicles and Yerf-Dog utility carts. The is a round-slide, constant velocity (CV) carburetor
Constant velocity type, utilizing a vacuum-operated slide rather than a direct cable-actuated slide. Diagram and Component Insights
: Meters the volume of fuel at closed throttle.
Controls fuel delivery from idle up to 1/4 throttle.