Often asked: Why Does My Lawn Mower Start But 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 only run for a few seconds then dies?

If your lawn mower starts, runs briefly, then dies these are the four most common reasons that’s happening: Dirty carburetor / clogged carburetor bowl. Old gasoline that has gone bad. Dirty or defective spark plugs.

Why does my lawnmower start and then shut off right away?

The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. This stops the flow of fuel to the carburetor causing the engine to stall. To determine if the fuel cap vent is clogged, try slightly loosening the cap and then starting the engine.

Why does my lawn mower keep shutting off?

The loss of air flow to the engine caused by too tall or too thick grass or a dirty air filter is often the reason a mower engine stalls. When you try to mow on overgrown lawn, you end up clogging the air filter and shutting off air to the engine.

How do you clean a carburetor on a lawn mower without removing it?

How to Clean Your Carburetor?

  1. Turn Off Mower. Completely turn off the lawn mower and also let the engine cool down for a few minutes before you can begin any cleaning procedures.
  2. Inspect the Air Filters.
  3. Check all Connections to the Carburetor.
  4. Clean the Carburetor.
  5. Contact Your Local Dealer.
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Why does my lawn mower only run on full choke?

If your lawn mower only runs with the choke on, check the carburetor. The carburetor brings air and fuel together and mixes them in the perfect ratio for combustion before they enter the engine. There are several passages in the carburetor that allow fuel to enter the air stream depending how the throttle is set.

Why does my mower keep dying?

The fuel cap vent is clogged If your lawnmower keeps dying, the carburettor is always the first part to check. But it’s not always the cause of the problem. If your lawnmower starts then dies, a blockage in the fuel cap vent is also a possible problem. If it starts with no issues, you may need to replace your fuel cap.

How do you clean a lawn mower carburetor?

Detailed Guide on How to Clean Lawn Mower Carburetor

  1. Remove the Outer Casing and Air Filter.
  2. Removing the Carburetor.
  3. Unbolt the carburetor’s bowl and clean the nut.
  4. Use a carburetor cleaner to get rid of dirt deposits within the carburetor.
  5. Replace the gasket.
  6. Check its settings.
  7. Reassemble and reattach.