{"product_id":"ngk-spark-plug-lfr6a-4-pack-for-watercraft-26-5mm-reach-v-power-v-cut-16mm-hex","title":"NGK Spark Plug LFR6A 4-Pack for Watercraft — 26.5mm Reach, V-Power V-Cut, 16mm Hex","description":"\u003cp\u003e\u003cstrong\u003eNGK LFR6A 6668 is a genuine 4-pack V-Power spark plug set designed to restore reliable ignition in compatible watercraft engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis set contains four brand-new NGK V-Power LFR6A (part 6668) spark plugs built with a 26.5mm reach, 16mm hex, 0.9mm electrode gap and a 5 kΩ internal resistor. The plugs use NGK’s V-Power v-cut center electrode to help the spark form at the electrode edge, which improves ignitability and reduces quenching in small-displacement marine engines. These plugs are offered as a direct-fit replacement for a range of Yamaha-style watercraft models including FX, FZR, FZS, VX, VXR and VXS where LFR6A is specified.\u003c\/p\u003e\n\n\u003ch3\u003eWhich watercraft will these plugs fit?\u003c\/h3\u003e\n\u003cp\u003eThese NGK LFR6A plugs match the common specifications for many Yamaha and similar watercraft engines that call for a 26.5mm reach and 16mm hex. Always check the owner’s manual or the OEM service data to confirm fitment before purchasing.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible models: FX, FZR, FZS, VX, VXR, VXS (when LFR6A is specified)\u003c\/li\u003e\n  \u003cli\u003ePhysical specs: 26.5mm reach, 16mm hex size for standard wrench fit\u003c\/li\u003e\n  \u003cli\u003eElectrical specs: 0.9mm gap, 5 kΩ resistor built in\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the V-Power v-cut design affect ignition?\u003c\/h3\u003e\n\u003cp\u003eThe V-Power v-cut centers the spark toward the electrode edge which encourages faster spark development and reduces quenching near the electrode surfaces. That helps with initial ignitability under a range of engine conditions without changing engine tuning.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirects spark to electrode edge for quicker flame kernel formation\u003c\/li\u003e\n  \u003cli\u003eReduces quenching that can slow ignition in small chambers\u003c\/li\u003e\n  \u003cli\u003eMaintains stable spark performance across load changes\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key installation and maintenance points?\u003c\/h3\u003e\n\u003cp\u003eInstall these plugs to the manufacturer’s torque spec and confirm the 0.9mm gap before fitting. Replace in sets for multi-cylinder engines and inspect for fouling, electrode wear or deposits during routine maintenance.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck and set gap to 0.9mm if needed before installation\u003c\/li\u003e\n  \u003cli\u003eTorque to vehicle OEM specification using a 16mm socket on the hex\u003c\/li\u003e\n  \u003cli\u003eReplace all cylinders in the same service interval for consistent performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose NGK LFR6A over generic plugs?\u003c\/h3\u003e\n\u003cp\u003eNGK is a widely trusted OE supplier; the LFR6A uses a resistor to suppress interference, a proven v-cut electrode geometry, and materials matched for marine environments. Choosing genuine NGK ensures the part matches factory specs for fit and electrical behavior.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGenuine NGK manufacturing and quality control\u003c\/li\u003e\n  \u003cli\u003eBuilt-in 5 kΩ resistor to limit electromagnetic interference\u003c\/li\u003e\n  \u003cli\u003eDesigned for consistent fitment and reliable ignition in specified watercraft\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This four-pack of NGK LFR6A 6668 plugs is aimed at watercraft owners and mechanics who need OEM-spec replacement spark plugs for compatible Yamaha-style models. It’s appropriate for routine maintenance, tune-ups, or part restoration when the vehicle manual specifies an LFR6A-type plug with a 26.5mm reach and 0.9mm gap. If you value consistent ignition performance from a recognized OE supplier, this NGK set is a direct, ready-to-install option.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are these NGK LFR6A plugs a direct fit for my VX or VXR watercraft?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If your owner's manual lists LFR6A or part 6668 with a 26.5mm reach and 16mm hex, these are a direct-fit replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs include a resistor to reduce interference?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, each NGK LFR6A plug includes a built-in 5 kΩ resistor to help suppress electromagnetic interference.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":48083168886942,"sku":"B07PGPVQFL","price":56.3,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/ngk-lfr6a-front-packaging_28056e0c-cad2-40e6-a177-27b771de1de5.jpg?v=1785827472","url":"https:\/\/northtrailauto.ca\/products\/ngk-spark-plug-lfr6a-4-pack-for-watercraft-26-5mm-reach-v-power-v-cut-16mm-hex","provider":"North Trail Auto","version":"1.0","type":"link"}