FAST Air Fuel Ratio Meter - Popular Carb Tuning Photo Gallery
The top half of the carb also holds the accelerator pump. The accelerator pump's job is to squirt extra fuel into the carb during acceleration. It's a good idea to check the accelerator pump plunger for cracks and wear. If the accelerator is not working correctly then the engine can go lean when you decide to push on the accelerator causing a bog or lack of power.