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HomeRepair HelpRepairSmall engine hard to start Repair
Small engine hard to start
When a small engine is hard to start, begin with the spark plug, the most likely cause of engine starting problems. Inspect it for a cracked insulator, burned electrode, or heavy carbon buildup, then use a spark plug tester while cranking the engine. A weak or missing spark usually means the spark plug needs replacement. Next, check the carburetor. A clogged carburetor can restrict fuel flow, while a choke that does not close properly can deliver too much fuel and cause hard starting. Stale or ethanol-blended fuel left in the carburetor is one of the most common root causes on seasonal equipment, including a lawn mower or snowblower that is hard to start. If the spark plug and carburetor check out, test the fuel cap by loosening it slightly before starting. A clogged fuel cap vent can prevent air from entering the fuel tank, creating pressure that makes the engine hard to start. These checks can help identify why your engine takes multiple pulls to start or will not start when cold. Enter your model number to find the exact replacement spark plug, carburetor, or fuel cap for your specific engine.
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.
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02 - Carburetor
The engine may be getting too much fuel or not enough fuel. This is usually due to the carburetor not working properly. If the carburetor is clogged, the engine won't get enough fuel. If the carburetor choke isn't closing properly, the engine may get too much fuel.
Highly Likely
03 - Fuel Cap
As fuel is consumed, the pressure in the gas tank rises. To relieve this pressure, the gas cap uses a small vent to allow air to enter the gas tank. If the gas cap vent is clogged, air won’t be able to enter the gas tank, and the pressure in the tank will begin to rise. When the pressure in the gas tank exceeds the pressure in the engine, the engine may be hard to start. To determine if the gas cap vent is clogged, try slightly loosening the gas cap and then starting the engine. If the loosening the gas cap allows the engine to stay running, this indicates that the gas cap vent is clogged. If the gas cap vent is clogged, r...
Common
Frequently Asked Questions
Why is my small engine hard to start when cold?
What should I check when my small engine takes multiple pulls to start?
Can a clogged fuel cap make a small engine hard to start?
How do I find the correct spark plug or carburetor part for my small engine?
What should I do before repairing a small engine that is hard to start?