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Spark plug gap for 15 hp mercury

" Gap your NGK BP8HS-15 plugs

" Gap your NGK BP8HS-15 plugs to 0.060"(1.5mm). It should be noted that you should not use the same spark plug as the 9.9HP, 8HP or the 6HP models. They take a NGK BP8H-N-10 gapped at 0.040"(1.0mm). "
 
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