Here we will demonstrate how to check, service or replace an ignition coil in a Briggs & Stratton 3.5HP
this is similar in most Briggs & Stratton engines between 3-6HP
- Phillips Head Screwdriver
- Socket Wrench - 10mm & 8mm Sockets
- Wire Brush Optional
Remove throttle cable and top cover from the lawn mower. Ensure that the spark plug and the spark plug leads are not in contact.
Inspect the position of the ignition coil to ensure it is in close enough proximity to the fly wheel. Then remove the ignition coil by loosening screws attaching it (also disconnect the wire attached to the ignition coil).
Inspect the wire previously connected to ignition coil for any damage.
If needed use the wire brush attachment and the electric drill to remove any rust present on the metal portion of the ignition coil, closest to the fly wheel when screwed into position (be careful not to separate the layers of metal forming this part of the ignition coil). Also remove any rust present on the magnetic strips located on the fly wheel.
Re-install the ignition coil, remembering to first re-connect the wire previously attached, then test the spark of the mower. If there is still no spark occurring it is likely that the ignition coil needs replacing.
Assuming a spark is now being generated, place the cover back over the engine.