Spark Plugs for a 2030

I have been trying to find out what plug to put in my JD 2030. I finally found the Champion numbers in the JD parts catalogue. They say Champion J6Y for heavy use or J11Y for lighter use. Is 11y hotter? Is there a better plug to use? I will use it around the yard and maybe on a bush hog. No heavy field work.
 
Back when the 2030 was new, it called for a Champion N11Y. My 1980 Champion book says the same. That is a 14 mm threaded plug with a 3/4" reach and "Y" for "turbo action", whatever that is.

A J11Y is the same heat-range and so-called "turbo-action" but with a much shorter 3/8" reach.
 
The first letter tells how long the reach of the plug is. "N" stands for 3/4" reach. "J" stands for 3/8" reach. The number after the letter is the heat-range and the higher the number the hotter the plug runs. Letters at the end (if any) stand for special ground-electrode shapes or configurations. "Y" stands for what Champion calls "turbo action."
 
I just looked in the back of the 1980 Champion book for further explanation of the "Y" for "turbo-action." It is a plug with a "projected core nose."
 
Auto parts store gave me Autolite 66. Cross reference shows J11Y is a Autolite 55 or 64. I might take the 66 back and get Champions. I don't know how much a small difference in number matters.
 
I looked it up in my Autolite and NGK books. Same config as what my Champion books show. All have a 3/4" reach and NOT a 3/8" reach like those J-series plugs you mentioned. Autolite XP64 or NGK BP5ES
 
The reach would certainly matter to me. Autolite # 64 is a 3/4" reach plug. Champion J11Y is a much shorter 3/8" reach plug. #64 is the cheap Autolite and "premium" is a XP64.
 
I do not use Champs or auto lite plugs any more because I have found they do not hold up well any more since there both made i the land of almost right. Now days I have switched all my machines to NGK plugs when ever I change plugs and have had very good luck with them
 
Considering your engine already had the 3/4" reach N6 plugs in it - it makes sense to stick with what was recommended when your tractor was "current" and not a "collector's item." I see lots of bad info in new catalogs and I suspect that is to cut down on inventory.
 

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