{"product_id":"ngk-spark-plug-4838-bp8hn-10-v-power-replacement-for-mercury-outboards-1980-2002-and-mariner-outboards-1985-2002","title":"NGK Spark Plug 4838 (BP8HN-10) V-Power Replacement for Mercury Outboards 1980-2002 and Mariner Outboards 1985-2002","description":"\u003cp\u003eNGK spark plug 4838 (NGK part number BP8HN-10) is a V-Power spark plug built as a replacement for Mercury and Mariner outboard engines. The V-Power design uses a \"V\" cut in the center electrode to help direct the ignition spark to the edge of the electrode, aiding spark development and improving ignitability compared to a standard flat electrode. The plug uses a copper center electrode core for efficient heat dissipation and conductivity, with a nickel center electrode tip and a nickel ground electrode for durability under marine operating conditions. The threaded terminal design allows for straightforward installation and removal during routine maintenance. Electrical resistance is rated at 1 Ohm with a standard ground configuration. Thread size is 14mm x 1.25mm, matching the mounting thread of the outboard powerheads it is designed for. NGK 4838 (BP8HN-10) is intended for Mercury Outboards built 1980-2002 and Mariner Outboards built 1985-2002; always check your engine and maintenance manual to confirm the correct spark plug for your specific powerhead, and only use plugs recommended by your engine's original equipment manufacturer, since using the wrong plug can reduce performance, reduce fuel economy, or damage the engine. This plug is packaged in a standard pack of 10.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NGK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 4838\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNGK Part Number:\u003c\/strong\u003e BP8HN-10\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Type:\u003c\/strong\u003e V-Power\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e 14mm x 1.25mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 1 Ohm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Configuration:\u003c\/strong\u003e Standard\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Core Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Tip Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Electrode Core Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 10 count\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 087295176450\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Outboards, 1980-2002\u003c\/li\u003e\n\u003cli\u003eMariner Outboards, 1985-2002\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eQuicksilver \/ Mercury 33-816737Q\u003c\/li\u003e\n\u003cli\u003eYamaha BP8-HS-100-00-00\u003c\/li\u003e\n\u003cli\u003eJohnson \/ Evinrude 0509569\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does NGK spark plug 4838 (BP8HN-10) fit?\u003c\/strong\u003e NGK 4838 (BP8HN-10) is designed for Mercury Outboards built 1980-2002 and Mariner Outboards built 1985-2002. Always confirm against your engine's maintenance manual before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the NGK BP8HN-10 replace?\u003c\/strong\u003e The NGK BP8HN-10 (stock number 4838) replaces Quicksilver\/Mercury 33-816737Q, Yamaha BP8-HS-100-00-00, and Johnson\/Evinrude 0509569.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs NGK 4838 a genuine NGK plug or an aftermarket copy?\u003c\/strong\u003e NGK 4838 is a genuine NGK V-Power spark plug carrying the NGK part number BP8HN-10, not a third-party aftermarket copy of an OEM design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the thread size on the NGK BP8HN-10 spark plug?\u003c\/strong\u003e The NGK BP8HN-10 (part 4838) has a 14mm x 1.25mm thread, matching the mounting thread on the Mercury and Mariner outboard powerheads it is built for.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat electrode materials does NGK 4838 use?\u003c\/strong\u003e NGK 4838 uses a copper center electrode core with a nickel center electrode tip and a nickel ground electrode, a combination chosen for heat dissipation and conductivity.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many spark plugs come in a pack of NGK 4838?\u003c\/strong\u003e NGK spark plug 4838 (BP8HN-10) is packaged in a standard pack of 10.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does the \"V\" cut in the NGK BP8HN-10 electrode do?\u003c\/strong\u003e The V-Power design in the NGK BP8HN-10 (4838) cuts a \"V\" into the center electrode to help direct the ignition spark to the electrode edge, aiding spark development and ignitability.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs NGK BP8HN-10 the same as NGK BP7HS-10?\u003c\/strong\u003e No. NGK 4838 (BP8HN-10) is a V-Power plug fit for Mercury Outboards 1980-2002 and Mariner Outboards 1985-2002, while BP7HS-10 is a separate NGK Standard plug listed for different Mercury, Nissan, and Tohatsu outboard applications; they are not interchangeable part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the electrical resistance rating of NGK 4838?\u003c\/strong\u003e NGK spark plug 4838 (BP8HN-10) has a resistance rating of 1 Ohm with a standard ground configuration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I install the NGK BP8HN-10 spark plug?\u003c\/strong\u003e The NGK BP8HN-10 (4838) uses a threaded terminal for straightforward installation and removal; check your engine's maintenance manual for correct torque and gap before installing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan using the wrong spark plug damage my outboard?\u003c\/strong\u003e Yes. Using a plug other than the one recommended by your engine manufacturer, in place of NGK 4838 where it is specified, can reduce performance, lower fuel economy, or cause engine damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the NGK 4838 spark plug weigh?\u003c\/strong\u003e NGK spark plug 4838 (BP8HN-10) weighs 0.15 pounds.\u003c\/p\u003e","brand":"NGK Spark Plugs","offers":[{"title":"Default Title","offer_id":49028253253851,"sku":"NGK-BP8H-N-10","price":3.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/33-816737Q__51940.1722351308.500.750.jpg?v=1785165221","url":"https:\/\/www.goodvibesmarina.com\/products\/ngk-spark-plug-4838-bp8hn-10-v-power-replacement-for-mercury-outboards-1980-2002-and-mariner-outboards-1985-2002","provider":"Good Vibes Marina","version":"1.0","type":"link"}