NGK BU8H Semi-Surface Gap Spark Plugs feature small side electrodes that do not require gap adjustment and are nearly immune to pre-ignition (knocking). The semi-surface discharge design improves ignition and burns off carbon before it can build up to foul the plug. With trivalent metal plating for anti-corrosion and a copper core for efficient heat removal, these plugs are engineered for the demanding conditions of marine engines.
- Semi-surface gap design is nearly immune to pre-ignition
- Does not require gap adjustment (pre-gapped)
- Burns off carbon buildup to prevent plug fouling
- Trivalent metal plating provides superior anti-corrosion in saltwater
- Meets Mercury Marine original equipment manufacturer specifications
