Lawn mower gasoline engines and automobile gasoline engines both use spark plugs to ignite the fuel/air mixture in their cylinders. The spark plugs in both types of engine work on the same basic principle.
Also question is, how do you change a spark plug on a lawn mower?
Consequently, what should a lawnmower spark plug look like?
Its center electrode should have a flat top. If its top is rounded, then the spark plug must be replaced. Look for cracks or chips in the spark plug's porcelain sheath as well as pitting on its firing electrode.
How often do you change spark plugs in lawn mower?
However, you can not spray the carburetor when the engine is off since it cannot do the cleaning without being propelled. All you need to do is to start the engine and spray directly at the center of the carburetor while it is running. Any deposits clogging in the carburetor will easily be removed.
If your mower is difficult to start, a worn-out spark plug may be the culprit. Replacing a spark plug is one of the easiest tasks of lawnmower maintenance. The only tools you'll need are a ratcheting socket driver, a spark plug socket and a spark plug gauge.
For standard lawn mower and small engine maintenance, you should check and/or replace spark plugs: Annually and in accordance with the Operator's Manual. If your lawn mower or outdoor power equipment won't start.
Ideally, most automobile spark plugs use a thread size of about 14mm thread why those of lawn mower range between 10 to 12 mm. Because of these differences in thread sizes, they just won't fit into the same hole or the unit in which the plug is to be fit in.