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Category: Small Engine
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My 7hp engine backfires when I shut it off, what is wrong?

Customer Question

my 7hp engine backfires when I shut it off, what is wrong?
JA: Can you guesstimate how old the engine is? And has it done anything like this in the past?
Customer: 2012 troy built rototiller
JA: Do you plan on doing the work yourself?
Customer: yes
JA: Anything else we should know to help you best?
Customer: it has old gas in it
Submitted: 1 month ago.
Category: Small Engine
Expert:  kwiggins29059 replied 1 month ago.

Hello, some possible causes and solutions are

Backfire typically occurs when the engine is decelerated rapidly.

Common Causes of Backfire:

  • Lowering engine speed too fast
  • Gasoline, which contains higher blends of alcohol
  • Carburetor adjustment set too lean
  • Muffler construction can induce backfire
  • Higher than normal engine temperatures
  • Some carburetors can induce backfire due to the sensitivity of internal transitional passages
    (This condition cannot be corrected).

Possible Fixes for Backfiring:

  • Lower engine speed slowly
  • Follow small engine fuel recommendations and/or switch to brands with low or no alcohol
  • Adjust carburetor for optimum performance
  • Inquire with equipment manufacturer about increasing air volume to decrease engine temperature

If you are using an e10 blend fuel that is most likely the issue. Let me know if I may be of further help.

Expert:  kwiggins29059 replied 1 month ago.

Hello, I was just wanting to follow up and see how things went.