{"product_id":"ngk-spark-plug-set-of-4-dpr6ea-9-nickel-copper-resistor-0-036-pre-gapped","title":"NGK Spark Plug Set of 4 DPR6EA-9 – Nickel\/Copper Resistor, 0.036\" Pre-Gapped","description":"\u003cp\u003e\u003cstrong\u003eNGK DPR6EA-9 is a set of four nickel\/copper resistor spark plugs built to OEM specs for mid-projection, standard-performance ignition in compatible motorcycles and cruisers.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis four-pack of NGK DPR6EA-9 (part number 5531) plugs delivers OE-style construction with a copper core, nickel-plated tip, and a ceramic insulator engineered for reliable starting and consistent combustion. Each plug features a 0.036 in (0.9 mm) pre-gap, an 18 mm hex, 0.750 in (19 mm) reach and a flat seat with a crush washer for secure sealing. The DPR6EA-9 is a resistor-type, 5000-ohm plug with a J-gap ground configuration and mid projection center electrode that suits many V-twin and large-displacement motorcycle engines where original equipment nickel alloy plugs are specified.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and models commonly use DPR6EA-9 plugs?\u003c\/h3\u003e\n\u003cp\u003eThe DPR6EA-9 matches several Kawasaki Vulcan 1500 variants and a broad range of Triumph Thunderbird and Thunderbird-derived models across multiple years and displacements. Always cross-check your vehicle’s owner manual or existing plug part number before ordering to ensure fit and correct heat range selection.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eKawasaki VN1500E, VN1500J\/R, VN1500L, VN1500N, VN1500P — 1471cc with 0.036\" gap\u003c\/li\u003e\n  \u003cli\u003eTriumph Thunderbird series and variants (1597–1700cc and related models) with 0.036\" gap\u003c\/li\u003e\n  \u003cli\u003eCheck application notes and OEM equivalence when replacing factory precious-metal plugs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does the DPR6EA-9 construction affect performance and longevity?\u003c\/h3\u003e\n\u003cp\u003eNGK engineered these plugs with a solid copper core for excellent thermal transfer and a nickel alloy tip that mirrors traditional OE designs. The high-grade alumina-silicate ceramic insulator and trivalent metal plating resist corrosion, while the resistor reduces ignition noise for electronic systems.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCopper core improves heat dissipation and conductivity for stable spark energy\u003c\/li\u003e\n  \u003cli\u003eNickel tip provides a cost-effective, OE-style electrode surface\u003c\/li\u003e\n  \u003cli\u003eCeramic insulator and triple gasket sealing reduce leakage and electrical stress\u003c\/li\u003e\n  \u003cli\u003e5000-ohm resistor helps prevent radio-frequency interference with onboard electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat installation and maintenance details should I know?\u003c\/h3\u003e\n\u003cp\u003eThese plugs come pre-gapped to 0.036 in (0.9 mm) and include crush washers for proper sealing to a flat seat. Use an 18 mm socket and a torque wrench to the vehicle manufacturer’s specification; avoid over-tightening to protect the threads and sealing surface.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePre-gap: 0.036 in (0.9 mm); verify gap before installation\u003c\/li\u003e\n  \u003cli\u003eHex size: 18 mm; reach: 0.750 in (19.0 mm); seat type: flat with crush washer\u003c\/li\u003e\n  \u003cli\u003eInsulator height: 50.0 mm and center electrode projection: mid-projection\u003c\/li\u003e\n  \u003cli\u003eFollow torque specs and replace in sets of matching plugs for balanced firing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre these DPR6EA-9 plugs the right choice over precious-metal types?\u003c\/h3\u003e\n\u003cp\u003eDPR6EA-9 plugs are engineered as standard-replacement nickel\/ copper plugs ideal for engines originally equipped with nickel alloy electrodes. They are not recommended for engines that require factory-installed precious-metal or long-life plugs, where different material properties are necessary.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRecommended when original equipment uses nickel alloy plugs\u003c\/li\u003e\n  \u003cli\u003eNot advised for applications that originally specified platinum or iridium plugs\u003c\/li\u003e\n  \u003cli\u003eChoose based on OEM recommendations to preserve engine tuning and service intervals\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Riders, mechanics, and DIY motorcycle owners seeking an affordable, OE-style spark plug replacement for Kawasaki Vulcan 1500 series and many Triumph Thunderbird family models. This NGK four-pack is suitable for those who want reliable ignition performance, straightforward installation, and the proven durability of NGK’s standard nickel alloy spark plug design.\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: Is the DPR6EA-9 pre-gapped?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes, DPR6EA-9 arrives pre-gapped to 0.036 in (0.9 mm), but you should verify the gap before installation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can DPR6EA-9 replace precious-metal plugs?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No, DPR6EA-9 is a nickel\/copper OE-style plug and is not recommended where factory precious-metal plugs are specified.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":55165564485975,"sku":"B00M5EVA9E","price":30.69,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1050\/1524\/7191\/files\/ngk-dpr6ea-9-front-packaging.jpg?v=1790355674","url":"https:\/\/britishgarage.co.uk\/products\/ngk-spark-plug-set-of-4-dpr6ea-9-nickel-copper-resistor-0-036-pre-gapped","provider":"British Garage","version":"1.0","type":"link"}