Genuine Champion SPARK PLUG L77JC4 821-1 Marine L4G L77JC Small Engine for sale online | eBay
Johnson 0384771 - SPARK PLUG, Ch ul-77v, 140 HP. Alternate plugs for susstained slow operation:Champion L77J4 Part number 386941or AC M40FFX ,Part number 38639. | Boats.net
Not Easy to Choose Spark Plugs for Outboards These Days