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I have a 1997 John Deere 345 18hp that needs new plugs. I do not have a owners manual. Can someone tell me what plug to use. It has Champion CJ8 plugs now.
 

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It depends on which engine you have. This is listed in JD Parts:

23M71939Spark Plug2(BMR6A, (NGK)), (ENGINE MARKED FD5 90V-AS04, FD590V-BS04, FD590V-CS04)
M71939Spark Plug2(BMR6A, (NGK)), (ENGINE MARKED FD611V-AS0 1, FD611V-BS01, FD611V-CS01, FD611V-DS01)
M802138Spark Plug2(BPR5ES, (NGK)), (ENGINE MAR KED FD611V-ES01, FD611V-FS01)
 

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You want the NGK BMR6A,gap0.028",tighten to 15 ft lbs
 
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