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Spark Plug Question

counselor

New member
Have a Sea King (Montgomery Ward) 5 hp. Current spark plug is a Chapion J4C. Have seen other recommendations of a J12C or RJ12C. Any one know what the correct one is? Found these numbers on the engine.

Model K500 2106 A
Serial 714127
Type 27405 R (There are a couple of letters before this but are unreadable)
 
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