Anonymous-0

Well-known Member
Don't laugh at this rookie question but what thread is the spark plug hole tapped on a JD G? Apparently not 3/4" x 16.
 
1000yd,
It depends on the year of your G. Unstyled G's (less than s/n 13000) used a 7/8-18 thread, and anything later used an 18mm thread.
 

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