You might try to use krol as this oil can creep into the smallest cracks to help loosen the spark plug. http://www.kanolabs.com/
The next problem will be the threads probably will be stripped. Use a Time-Sert insert to repair the stripped threads.
http://www.timesert.com/html/sparkplug.html
http://www.timesert.com Good luck!
If the spark plug is stripped, replace it, if the hole in the cylinder head is stripped, the first thing to do is run a tap or thread chaser through the hole, if that does not work, you will need a helicoil http://en.wikipedia.org/wiki/Helicoil
Could be that the threads are stripped on the plug or the head where the plug is screwed in. Or maybe it's the wrong plug..
Not tightened properly? Threades stripped?
yes but is is cost effective? that's your call
To fix a weed eater with a stripped spark plug hole, you can use a spark plug thread repair kit, which typically includes a tap and inserts designed to create new threads for the spark plug. First, clean the area around the hole, then tap it to create new threads. Next, insert the threaded insert according to the kit instructions, ensuring it’s securely in place. Finally, replace the spark plug and check for a proper fit to ensure a good seal.
Take it to a shop. Cheap fix or call and ask if they have a deep socket!
Did you strip the actual plug is rounded off or did you strip the plug threads? If you stripped the plug itself and can get to it use vise grips. If you cannot get to the plug then go to your local parts store and tell then what happened. I know Snap On makes a special socket to remove rounded off bolts and spark plugs. Now if you actually stripped the spark plug threads then you may be able to just chase the old threads with a tap and clean them up enough that you can insert a new plug. Use anti-sieze compound and do not over tighten. 13 ft/lbs and no more. If that is not possible you will have to purchase a Helicoil. You local parts store can sell you the correct size and tell you how to use it.
Either the spark plug needs to be tightened or the threads have been stripped out. Also the rings are shot to allow that much oil into the combustion chamber.
This is a specialist job and needs to be handeled by one, Sometimes the head needs to come off. Take it to a garage.
Repair kit availale at most auto parts stores
A 1989 Chevy Corsica may blow a spark plug out due to several factors, including excessive engine wear, which can lead to stripped threads in the cylinder head. Overheating can also cause thermal expansion, weakening the hold of the spark plug. Additionally, improper installation or using the wrong spark plug type can increase the likelihood of failure. Lastly, detonation or pre-ignition issues can create excessive pressure, contributing to the spark plug being expelled.
Don't know much about lawnmowers but I work on cars. So either ur threads in the head are stripped and/or ur exhaust system is clogged, making the pressure come out of the weakest area which in your case is the spark plug hole