What is the purpose of using a 0.254 mm feeler gauge during ignition module installation?

The use of a 0.254 mm feeler gauge during the installation of an ignition module is specifically for setting the gap between the flywheel magnet and the legs of the ignition module. This gap is crucial for ensuring proper ignition timing and optimal engine performance. If the gap is too wide or too narrow, it can lead to weak or faulty sparks, which negatively impacts starting and overall engine efficiency.

Using a feeler gauge allows for precise measurement to maintain the correct distance, ensuring that the ignition module functions as intended. Properly setting this gap is key because it helps the module create a strong magnetic field, thus generating sufficient voltage to ignite the fuel-air mixture in the engine.