This blog is a step-by-step instruction for replacing the on/off switch on Briggs and Stratton lawn mower small engine. The most common reasons for replacing the on/off switch is if the engine will not start or stop.

Replacement

Before you begin the replacement, you need to make sure the engine has cooled and remove the wire and boot from the spark plug to prevent the engine from accidentally starting. It is better for there be little or no fuel in the tank.
Step 1: Use a 5/16 inch nut driver to unthread the two screws securing the throttle cover plate. Shift the throttle lever to the right so you can detach the plate.
Step 2: Next use a 10 millimeter socket to unthread the two front screws securing the fuel tank to the bracket. Use a 10 millimeter wrench to unthread the two rear screws securing the tank and move the tank out of the way.
Step 3: Use a needle nose pliers to depress the tab to release the on/off switch from the bracket. Straighten the switch wire, then bend the metal training tab to release the wire and remove the old switch to install the new on/off switch. Bend the retaining tab and insert the wire into the hole in the plastic, then snap the switch tab into place in the bracket.
Step 4: Reposition the tank on the bracket then rethread the rear and front screws. Reposition the throttle cover plate and rethread the screws.
If necessary, refill the fuel tank and the engine should be ready for use.

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