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I own a John Deere 1458 mower and it takes an NGK plug #BPR5ES.
.030
champion RJ-12Y
Rj19lm or j19lm
a 5/8 socket
Should be 5/8
rtfm - manual says 0.030"
find the right size helicoil and drill out the hole to the proper size and install
try spraying some wd-40 where it screws in and let it sit for a day. then see if it will come out
Not sure how to answer your question with the right answer. However, lawn mower spark plugs come in three sizes: 5/8, 3/4 and 13/16.
Depends on the size of the lawn mostly. A push mower (or better yet a powered drive push mower) would have the best control in rough terrain, but if it is a large lawn a riding mower is better.
The Yardman Series push mower uses a 21 inch blade.