Small Engine Lookup

Lawn mower starts then dies or won’t stay running

Reviewed 6 primary sourcesSee sources

An engine that starts and then dies, or bogs down while mowing, is usually short of fuel or air, or working too hard. The manufacturers’ lists overlap with the no-start checks.

Checks in order

  1. Check fuel and the tank cap vent

    Stale or dirty fuel and a restricted fuel cap vent can stop an engine soon after it starts.[2]

  2. Check the air filter

    A dirty air filter shows up in every manufacturer list for stalling or lost power.[3][5][1]

  3. Check the oil level and debris screen

    Kohler lists an incorrect oil level and a dirty debris screen as causes of an engine stopping suddenly.[1]

  4. Reduce the load

    For power loss mid-mow, Briggs & Stratton suggests raising the cutting height in tall grass, clearing clippings from under the deck, and sharpening or replacing a dull, bent or loose blade.[3]

  5. Check the spark plug

    A dirty or faulty spark plug appears in both Kohler’s and Briggs & Stratton’s lists.[1][3]

What the symptom can point to

Dies at idle

Kohler lists a misadjusted idle mixture or idle speed; the fix is adjusting the idle or cleaning the carburetor.[2]

Deeper causes

Kohler also lists a faulty carburetor, a leaking head gasket or intake, a misadjusted choke or throttle, and intermittent kill-switch wiring.[2]

When to stop and book a repair

Related

Sources

Facts on this page are restated from the documents below and linked to the publisher. Check the document for your exact model before relying on a value.

  1. XT650, XT675, XT775 owner’s manualRehlko (Kohler engines) · 14 590 36 · Safety p. 2, high altitude p. 4, oil chart and maintenance p. 5, fuel p. 6, spark plug and air cleaner p. 7, troubleshooting and specifications p. 8 · retrieved
  2. XT series service manualRehlko (Kohler engines) · 14 690 01 Rev. G · Identification p. 5, troubleshooting guide pp. 13–14, carburetor causes p. 20, spark plug table p. 27 · retrieved
  3. Top 5 mower troubleshooting tipsBriggs & Stratton · “Your mower won’t start” and “You lose power in the middle of mowing” · retrieved
  4. 5 mower troubleshooting tipsBriggs & Stratton · “Inspect the air filter” and deck-clearing steps · retrieved
  5. Owner’s manual GCV160 · GCV190American Honda Motor Co. · 00X37Z8B 0029 · English section: safety pp. 5–7, fuel and oil p. 7, maintenance p. 8, problems pp. 9–10, specifications pp. 10–11 · retrieved
  6. Owner’s manual GCV170 · GCV200American Honda Motor Co. · 00X37Z9V 0004 · English section: fuel p. 9, oil and maintenance p. 10, problems p. 12, specifications and emissions symptoms p. 13 · retrieved

Primary publishers: Rehlko (Kohler engines), Briggs & Stratton, American Honda Motor Co.. Spotted an error? Email the address in the footer with the model and the document you are using.