{"product_id":"ngk-spark-plug-lfr5a-11","title":"NGK LFR5A-11 SPARK PLUG - 6376","description":"\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0056\/9429\/2079\/files\/ngk_logo_1.png?v=1780608867\" alt=\"\"\u003e\u003c\/p\u003e\n\u003ch2\u003eNGK LFR5A-11 V-Power Spark Plug – 6376\u003c\/h2\u003e\n\u003cp\u003eThe NGK LFR5A-11 V-Power Spark Plug, stock number 6376, is a proven replacement for select Yamaha, Mercury, and Mariner four-stroke outboard engines. Designed for dependable ignition under demanding marine conditions, this plug helps maintain quick starts, smooth idle quality, responsive acceleration, and consistent power throughout the RPM range.\u003c\/p\u003e\n\u003cp\u003eNGK's V-Power design features a V-cut center electrode that positions the spark toward the edge of the firing surface, helping promote reliable ignition of the air-fuel mixture. A solid copper core provides efficient heat transfer, while the resistor construction helps reduce electrical interference with onboard electronics.\u003c\/p\u003e\n\u003cp\u003eSpark plugs naturally accumulate deposits and electrode wear over time. Replacing them during scheduled maintenance can help correct hard starting, hesitation, intermittent misfires, rough running, and declining fuel efficiency. For compatible four-stroke outboards, the NGK 6376 provides a straightforward way to restore proper ignition performance.\u003c\/p\u003e\n\u003ch3\u003eSpark Plug Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturer: NGK\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePart Number: LFR5A-11\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNGK Stock Number: 6376\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSeries: V-Power\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePlug Type: Resistor\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCenter Electrode: Nickel alloy with copper core\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHeat Range: 5\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThread Diameter: 14 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThread Reach: 26.5 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHex Size: 16 mm \/ 5\/8\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSpark Gap: 1.1 mm \/ approximately .043–.044\"\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProjected firing tip\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSold Individually\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommon Yamaha Engine Applications\u003c\/h3\u003e\n\u003cp\u003eThe NGK LFR5A-11 \/ 6376 is specified for select Yamaha four-stroke outboards, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F75 75 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F80 80 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F90 90 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F95 95 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F100 100 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F150 150 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha LF150 150 HP Counter-Rotation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F200 200 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha LF200 200 HP Counter-Rotation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F225 225 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha LF225 225 HP Counter-Rotation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha F250 250 HP\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha LF250 250 HP Counter-Rotation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eCommon applications include the F80 from 1999, F90 from the mid-2000s, F100, F150 beginning in 2004, and select F200\/F225\/F250 engines. Exact usage varies by model designation and production year.\u003c\/p\u003e\n\u003ch3\u003eMercury \u0026amp; Mariner Engine Applications\u003c\/h3\u003e\n\u003cp\u003eNGK 6376 is also used in select Mercury and Mariner four-stroke engines, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eMercury 75 HP FourStroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMercury 90 HP FourStroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMercury 115 HP EFI FourStroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSelect Mercury 225 HP four-stroke applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMariner 75 HP Four-Stroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMariner 90 HP Four-Stroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSome Mercury four-stroke engines from this period shared Yamaha-derived engine architecture, making the LFR5A-11 applicable to specific Mercury and Mariner power packages.\u003c\/p\u003e\n\u003ch3\u003eCommon Boat Applications\u003c\/h3\u003e\n\u003cp\u003eBecause these outboards were offered by numerous boat manufacturers, the NGK LFR5A-11 can be found in compatible engine packages installed on boats such as:\u003c\/p\u003e\n\u003ch4\u003eGrady-White\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eGrady-White Fisherman 180\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGrady-White Fisherman 209\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGrady-White Freedom 205\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGrady-White Adventure 208\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eGrady-White Gulfstream 232\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eKey West\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eKey West 1720 Sportsman\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKey West 189 FS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKey West 203 FS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKey West 219 FS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eKey West 239 FS\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eSea Hunt\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eSea Hunt Triton 172\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSea Hunt Triton 188\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSea Hunt Triton 202\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSea Hunt Ultra 211\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSea Hunt Ultra 234\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCarolina Skiff\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eCarolina Skiff J-Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCarolina Skiff DLX Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCarolina Skiff JVX Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCarolina Skiff Sea Chaser models\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eScout\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eScout 175 Sportfish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eScout 195 Sportfish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eScout 205 Sportfish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eScout 210 XSF\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eScout 222 Sportfish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eHurricane\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eHurricane SunDeck 187\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHurricane SunDeck 217\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHurricane SunDeck 2200\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHurricane SunDeck Sport Series\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eParker\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eParker 1801 Center Console\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eParker 21 SE\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eParker 21 DV\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eParker 23 SE\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eParker 2320 Sport Cabin\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAdditional applications may include compatible Yamaha-powered Boston Whaler, Cobia, Skeeter, Pathfinder, Sportsman, Robalo, Tidewater, Sea Fox, Century, Sailfish, EdgeWater, Ranger, Stratos, and other fishing or recreational boats.\u003c\/p\u003e\n\u003ch3\u003eYamaha \u0026amp; Mercury Cross References\u003c\/h3\u003e\n\u003cp\u003eCommon reference numbers associated with this application include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eNGK LFR5A-11\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNGK 6376\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYamaha LFR-5A110-00-00\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMercury 33-859495\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eAlways confirm the OEM number and engine serial information before using a cross-reference for replacement.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eGenuine NGK LFR5A-11 V-Power spark plug\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eNGK stock number 6376\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePopular replacement for Yamaha four-stroke outboards\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFits select Mercury and Mariner applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eV-cut electrode promotes dependable ignition\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCopper core provides efficient heat dissipation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eResistor construction helps suppress electronic interference\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1.1 mm factory gap specification\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSupports smooth starting and consistent acceleration\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIdeal for seasonal maintenance and complete tune-ups\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDependable Ignition for Yamaha Four-Stroke Outboards\u003c\/h3\u003e\n\u003cp\u003eYamaha four-stroke engines depend on the correct spark plug specification to deliver smooth power and reliable performance. Electrode wear, combustion deposits, and repeated heat cycles can eventually weaken ignition quality, making periodic replacement an important part of preventative maintenance.\u003c\/p\u003e\n\u003cp\u003eWhether you're servicing a Yamaha F75, F80, F90, F100, F150, F200, F225, F250, or a compatible Mercury\/Mariner four-stroke, the NGK LFR5A-11 Spark Plug – 6376 provides proven NGK quality for dependable performance on the water.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFitment Note:\u003c\/strong\u003e Yamaha and Mercury have used different spark plug specifications within the same horsepower ranges as engine designs changed. Boat model and horsepower alone do not confirm compatibility. Verify \u003cstrong\u003eNGK LFR5A-11 \/ stock #6376\u003c\/strong\u003e against your engine model, production year, serial number, or original OEM spark plug before ordering.\u003c\/p\u003e","brand":"Donovan Marine","offers":[{"title":"Default Title","offer_id":50254709686529,"sku":"LFR5a11","price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0056\/9429\/2079\/files\/Screenshot2026-08-29083212.png?v=1788006741","url":"https:\/\/inboardpartshq.com\/products\/ngk-spark-plug-lfr5a-11","provider":"Inboard Parts HQ","version":"1.0","type":"link"}