Joe, Factory Lawn Boy SPARK PLUG 614009, replacement plugs champion CJ14, NGK plug # BMR4A.
Check the attached links,instruction and guides, Good luck
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Lawn Boy 10415 Lawn Boy Gold Series Walk Behind Mower 1995 SN 5900001...
614009 Spark Plug
Which spark plug for Lawnboy engine
https://www.shoplawnboy.com/Comergent/en/US/adirect/Toro?cmd=ToroLBOnlineModelLookup
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