Why does my lawn mower not start after it gets hot?

Air leaks cause an engine to pull in too much outside air, which throws off the gasoline-to-air ratio. As the engine heats, parts expand, and all tiny gaps become larger. The result is a poorly running engine and one that eventually stops. Loose bolts are a common culprit in a mower engine that shuts down when hot.

Why does my lawn mower stop running after 5 minutes?

Most lawnmowers have a vented gas cap. The vent is a check valve that allows air into the fuel tank but keeps gas fumes inside. After about 10 or 15 minutes, the vacuum will become strong enough that fuel will stop flowing to the carburetor and the lawnmower will die.

Why would a lawn mower not stay running?

A full gas tank and oil reservoir are the essential first steps when checking why the lawn mower won’t stay running, but the problem could also be a dirty filter, clogged carburetor, improper fuel mixture, or a dirty spark plug. However, you may need a lawn mower specialist to get you back to trimming your grass.

Why does my lawn mower shut off after a few minutes?

Condensation inside the gas tank is one culprit, but moisture can also enter the system through a loose or ill fitting gas cap. The best solution is to drain the mower’s gas tank and refill it with fresh gasoline. A clogged fuel filter can also cause a mower engine to die.

How do I know if my lawn mower engine is flooded?

You pull the machine out onto the lawn and give the starting cord several tugs. When nothing happens, you turn on the choke and continue pulling until you detect the familiar smell of gasoline, which means the engine is flooded.

Can you adjust timing on a Briggs and Stratton engine?

Rotate the flywheel to remove the feeler gauge tool from the ignition armature legs. Some 15 horsepower Briggs & Stratton engines are equipped with only an armature type ignition, so the ignition armature air-gap is the only timing adjustment required.