One likely problem has to do with the kill switch, or the handle that you hold while starting the lawn mower. There is usually a metal wire that runs from the actual kill switch near the motor to the handle lever. If that wire is stretched or just not sitting properly, then it might not be moving far enough to override the kill switch. My bet is that accounts for the vast majority of spark problems.
Obviously a bad spark plug will cause problems, corrosion being the usual suspect. You can clean it will some fine sandpaper but just buy a new one for 3 dollars.
Those are my 2 best answers.
how to replace plug wire on a toro mower
Would you use lawn mower plugs in your car?? NO!!!!
A good lawn mower spark plug will have just a small amount of brown deposit. In addition, the gap will be very close.
Buy a plug wrench.
To properly maintain your lawn mower spark plug and prevent oil buildup, regularly check and clean the spark plug, replace it if necessary, and ensure it is properly gapped. This will help ensure optimal performance of your lawn mower.
what spark plug do i need for a 3.75
What is the gap on the spark plug on a Brigg's stratton lawn mower Model#31P777 Type 0348E1?
No, not all lawn mower spark plugs are the same. Different lawn mowers may require different types or sizes of spark plugs to function properly. It is important to use the correct spark plug recommended by the manufacturer for your specific lawn mower model.
.030
.024-.028
In order to change the spark plug wires in a Toro lawn mower, the engine housing should be removed. The spark plug wire will then be disconnected which is a simple twisting movement under pressure. This is a very quick procedure.
Your lawn mower spark plug may be wet due to excess fuel in the engine or a faulty carburetor. To fix it, you can try cleaning or replacing the spark plug, adjusting the carburetor, or checking for any fuel leaks in the system.