NGK BPZ8H-N-10 V-Power Spark Plug - 4495

NGK BPZ8H-N-10 V-Power Spark Plug – 4495 The NGK BPZ8H-N-10 V-Power Spark Plug, stock number 4495, is a proven replacement for select Mercury and Mariner outboard engines. Designed for reliable ignition in two-stroke marine applications, its V-groove center electrode helps concentrate the spark at the edge of the electrode for dependable combustion, smooth acceleration, and consistent performance throughout the RPM range. Built around a copper-core center electrode with a nickel firing tip, the BPZ8H-N-10 provides effective heat transfer while standing up to the demanding operating conditions found in outboard engines. Its special resistor design also helps control electrical interference that can affect onboard electronics. A worn or fouled plug can contribute to difficult starting, rough idle, hesitation, reduced power, and poor fuel efficiency. Installing fresh NGK 4495 spark plugs during routine maintenance helps restore proper ignition and keeps compatible Mercury-powered boats running as intended. Spark Plug Specifications Manufacturer: NGK Part Number: BPZ8H-N-10 NGK Stock Number: 4495 Design: V-Power Center Electrode Core: Copper Center Electrode Tip: Nickel with V-groove Heat Range: 8 Thread Diameter: 14 mm Thread Reach: 12.7 mm Hex Size: 13/16" Seat Type: Gasket / flat seat Pre-Gap: .040" / 1.0 mm Ground Electrode: Single Resistor Type: Special resistor Sold Individually Common Mercury & Mariner Engine Applications The NGK BPZ8H-N-10 / 4495 is used in select Mercury and Mariner outboard engines, including: Mercury 6 HP 2-Stroke Mercury 8 HP 2-Stroke Mercury 20 HP 2-Stroke Mercury 25 HP 2-Stroke Mercury 30 HP applications Mercury 100 HP 2-Stroke Mercury 115 HP 2-Stroke Mercury 125 HP 2-Stroke Mercury 225 HP 3.0L applications Select Mariner 2-Stroke outboards Application years vary significantly by horsepower and engine family. For example, the BPZ8H-N-10 is listed for select Mercury 20 HP and 25 HP two-strokes from the early 1990s and 2001–2006, along with certain larger Mercury two-stroke engines. Common Boat Applications Because Mercury and Mariner outboards were installed by many boat manufacturers, the NGK 4495 may be found in compatible engine packages used on boats such as: Boston Whaler Boston Whaler Sport Boston Whaler Montauk Boston Whaler Dauntless Tracker Tracker Pro Team Tracker Pro Guide Tracker Targa Lund Lund Rebel Lund Adventure Lund Pro-V Sea Pro Sea Pro Center Console models Sea Pro Bay Boat models Carolina Skiff Carolina Skiff J-Series Carolina Skiff DLX Series Carolina Skiff center console models Bayliner Bayliner Capri Bayliner Trophy Select Mercury-powered runabout models Additional applications may include older Ranger, Nitro, Key West, Mako, Grady-White, Sea Ray, Princecraft, Lowe, Alumacraft, and other boats originally equipped with a compatible Mercury or Mariner outboard. Mercury / Quicksilver Cross References The NGK BPZ8H-N-10 / 4495 cross-references with select Mercury Marine spark plug numbers, including: Mercury 33-816837Q Mercury 33-816837B2 Mercury / MerCruiser 33-8168372 NGK BPZ8H-N-10 NGK 4495 Always verify the original plug number before using a cross-reference for replacement. Key Features Genuine NGK BPZ8H-N-10 V-Power spark plug NGK stock number 4495 Designed for select Mercury and Mariner marine engines V-groove electrode promotes dependable ignition Copper core provides efficient heat transfer Special resistor construction helps suppress electrical interference .040-inch factory gap specification Ideal for routine outboard maintenance and tune-ups Proven replacement for select Mercury 33-816837-series plugs Reliable Performance for Mercury Two-Stroke Outboards Two-stroke outboards depend heavily on proper spark plug condition for clean starting, smooth acceleration, and consistent power. Carbon deposits, electrode wear, or incorrect plug specifications can quickly affect how an engine performs. The NGK BPZ8H-N-10 provides a proven replacement option for compatible Mercury and Mariner engines, making it an excellent choice for seasonal service or a complete ignition tune-up. Fitment Note: Mercury used different spark plugs within the same horsepower ranges depending on model year, serial number, and engine configuration. Do not determine compatibility by boat model alone. Verify NGK BPZ8H-N-10 / stock #4495 against your Mercury or Mariner engine model, serial-number range, or original spark plug before ordering.