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Spark plugs 1962 40HP Johnson

cws68

Member
Went to get new plugs for motor (1962 40 HP Johnson model RKL-24) the old plugs were goners I think they said J4J been in there 30 years LOL BUT they gave me J6C. Motor runs but have to lean it out abit. Is this going to hurt the motor and should I find another place to find J4J's. Like to launch her finally after the past 6 months restoring her.
 
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