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Small engine runs poorly
Brand:Toro
Model:70040
Product:Small Engine
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Small Engine Runs Poorly? Small Engine Troubleshooting
01:46
Common solutions for: Small engine runs poorly
01 - Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
Genuine Part
Easy Fix
Fits your Toro Small Engine
$4.69Save $186.70 by Fixing it Yourself
1:04
Step-by-Step Spark Plug Replacement
Technician Verified
Difficulty:
Very Easy
Avg. Repair Time:Under 15 minutes
Highly Likely
02 - Fuel Filter
The fuel filter might be clogged. A clogged fuel filter is most commonly caused by leaving fuel in the engine for a long period of time. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the fuel filter and cause the engine to run roughly. If old fuel was left in the engine, drain the old fuel from the fuel tank and replace the fuel filter.
Genuine Part
Easy Fix
Less Common