Mercury - Quicksilver 816737Q NGK BP8HN-10 V-Power Spark Plug Sold Individually OEM Marine Plug 816737Q. Overview. A smooth-running engine starts with a good spark. The Quicksilver 816737Q NGK BP8HN-10 V-Power Spark Plug gives your outboard or inboard the reliable ignition it needs for clean starts and consistent power. This genuine NGK plug features a "V"-cut electrode that helps the spark jump more easily and burn fuel more efficiently - a small upgrade that makes a big difference in how your