Enter your engine's type number in this search field to show the parts that match your engine. Your engine's type number is the second part of the model number stamped on your Briggs & Stratton engine (see picture).. If you are testing out your new boost capacitor, be sure you allow several minutes between startups of your A/C. This ensures that pressures within the A/C system equalize and the compressor motor will start much easier. If it’s particulary hot out, the A/C system will have very high pressure on one side of the system after shutdown..