Thanks alot!this is what champion says
Champion Marine plug 5933 5933 .030 "Q-Series" inductor types (used in Copper Plus & Premium Stainless) are the only OMC approved replacement plugs for engines specified. Use of other types may cause engine misfire. For Commercial service use 876/QL16V.
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Champion Racing series 306 L86C .030 "Q-Series" inductor types (used in Copper Plus & Premium Stainless) are the only OMC approved replacement plugs for engines specified. Use of other types may cause engine misfire. For Commercial service use 876/QL16V.