Thake out the plug and pull the cord a few times that should clear any oil on the head clean plug and try again if the mower is old the piston rings are either worn or broken allowing oil to get into the fuel .
SOURCE: have Bolens series 080 22
When you take off the carburetor initially, you should change the gasket if it tears or just old looking, your problem is in the carburetor, probably. Take it apart remembering where the parts go. There are some diaphragms or gaskets and screens on some, tiny jets and such that are inside the little "bulb" or bowl, that can usually be taken off with a 10mm wrench. They also have little fiber gaskets and a bowl gasket or o-ring that must be in great condition with no trash. Clean off with starter fluid or carburetor cleaner.
SOURCE: need a spark plug size for a yardpro self
If your mower does not have "OHV", overhead valves. You can use a Champion j19lm spark plug.
If you discover you do have overhead valves; A Champion RC12YC, will work.
SOURCE: HI there, I got
There could well be a build up of sediment and debris in the main jet to the carburetor. It is easy to get to and clean. It is the brass bolt that holds the lower float bowl onto the main body of the carburetor. To clean it, drain your gas. Remove the bolt and external washer UNDER the carburetor bowl. Clean out the bowl of any sediment and/or water. To clean the brass bolt, use no metal objects. Carb/Choke aerosol spray cleaner will do the job. Pay close attention to the hole in the bottom of the bolt and the very small holes about 2/3 of the way up the bolt. Clean till shiny with holes cleared and reinstall. Your fuel flow problem and shut off condition may be solved.
SOURCE: just replaced head gasket, now has to much compression
Try checking the lash on your valves if it has overhead valves
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