{"product_id":"ngk-bpr5eix-6597-iridium-spark-plug-royal-enfield-classic-350-uce","title":"NGK BPR5EIX Iridium IX Spark Plug (6597) for Royal Enfield UCE 350\/500 \u0026 Classic 350 BS6 – Genuine Upgrade","description":"\u003cp data-start=\"261\" data-end=\"620\"\u003e\u003cstrong data-start=\"261\" data-end=\"293\"\u003eNGK BPR5EIX (Stock No. 6597)\u003c\/strong\u003e is an \u003cstrong data-start=\"300\" data-end=\"314\"\u003eIridium IX\u003c\/strong\u003e spark plug upgrade for cleaner ignition, smoother idle, and stronger consistency over long use. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"448\" data-end=\"451\"\u003eRecommended by NGK’s India 2-wheeler application chart for multiple \u003cstrong data-start=\"519\" data-end=\"548\"\u003eRoyal Enfield UCE 350\/500\u003c\/strong\u003e models (see compatibility below). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"622\" data-end=\"625\"\u003e\n\u003ch2 data-start=\"627\" data-end=\"671\"\u003eDESCRIPTION\u003c\/h2\u003e\n\u003cp data-start=\"672\" data-end=\"1083\"\u003eIf your bike feels slightly “lazy” on pickup, idles rough, or starts taking extra cranks—many times the culprit is a tired plug and an enlarged gap. \u003cstrong data-start=\"821\" data-end=\"836\"\u003eNGK BPR5EIX\u003c\/strong\u003e is an Iridium IX plug with a \u003cstrong data-start=\"866\" data-end=\"908\"\u003efine-wire iridium center tip (≈0.6 mm)\u003c\/strong\u003e designed to fire a stable spark with less voltage demand, helping improve cold starts, throttle crispness, and combustion consistency. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1085\" data-end=\"1333\"\u003eThis plug is a popular upgrade over standard nickel\/copper plugs because iridium resists wear better, so your gap stays stable longer (real-world life still depends on fuel quality, tuning, and riding style). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1335\" data-end=\"1601\"\u003e\u003cstrong data-start=\"1335\" data-end=\"1413\"\u003eCritical fitment clarity (the part Amazon\/Flipkart listings usually miss):\u003c\/strong\u003e BPR5EIX is a \u003cstrong data-start=\"1427\" data-end=\"1496\"\u003e14 mm thread, 19 mm reach, gasket-seat (flat seat), resistor plug\u003c\/strong\u003e, with factory gap typically listed as \u003cstrong data-start=\"1535\" data-end=\"1545\"\u003e0.8 mm\u003c\/strong\u003e for this model. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1603\" data-end=\"1954\"\u003eFor Royal Enfield riders, NGK’s official India chart explicitly lists \u003cstrong data-start=\"1673\" data-end=\"1684\"\u003eBPR5EIX\u003c\/strong\u003e for several UCE-era 350\/500 applications (including Classic 350 BS6 UCE-era models in that chart). We’ve structured the compatibility below so you can avoid wrong ordering—especially on newer platforms where plug type may differ. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"1956\" data-end=\"2091\"\u003eSold by Under The Hood: genuine sourcing, careful packing, and pre-dispatch support if you share your current plug code \/ bike variant.\u003c\/p\u003e\n\u003chr data-start=\"2093\" data-end=\"2096\"\u003e\n\u003ch2 data-start=\"2098\" data-end=\"2144\"\u003eKEY FEATURES \u0026amp; BENEFITS\u003c\/h2\u003e\n\u003cul data-start=\"2145\" data-end=\"3194\"\u003e\n\u003cli data-start=\"2145\" data-end=\"2294\"\u003e\n\u003cp data-start=\"2147\" data-end=\"2294\"\u003e\u003cstrong data-start=\"2147\" data-end=\"2207\"\u003eGenuine \u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003eNGK Spark Plug Co., Ltd.\u003c\/span\u003e\u003c\/span\u003e Iridium IX\u003c\/strong\u003e spark plug – Part \u003cstrong data-start=\"2226\" data-end=\"2237\"\u003eBPR5EIX\u003c\/strong\u003e \/ Stock \u003cstrong data-start=\"2246\" data-end=\"2254\"\u003e6597\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2295\" data-end=\"2417\"\u003e\n\u003cp data-start=\"2297\" data-end=\"2417\"\u003e\u003cstrong data-start=\"2297\" data-end=\"2332\"\u003eFine-wire iridium tip (~0.6 mm)\u003c\/strong\u003e for consistent spark and strong ignitability \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2418\" data-end=\"2541\"\u003e\n\u003cp data-start=\"2420\" data-end=\"2541\"\u003e\u003cstrong data-start=\"2420\" data-end=\"2443\"\u003eResistor type (5kΩ)\u003c\/strong\u003e helps reduce electrical noise and supports stable running \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2542\" data-end=\"2675\"\u003e\n\u003cp data-start=\"2544\" data-end=\"2675\"\u003e\u003cstrong data-start=\"2544\" data-end=\"2588\"\u003e14 mm thread + 19 mm reach + gasket seat\u003c\/strong\u003e (common spec used on listed RE applications) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2676\" data-end=\"2827\"\u003e\n\u003cp data-start=\"2678\" data-end=\"2827\"\u003eHelps with \u003cstrong data-start=\"2689\" data-end=\"2711\"\u003eeasier cold starts\u003c\/strong\u003e, \u003cstrong data-start=\"2713\" data-end=\"2730\"\u003esmoother idle\u003c\/strong\u003e, and \u003cstrong data-start=\"2736\" data-end=\"2758\"\u003ecleaner combustion\u003c\/strong\u003e when replacing a worn plug \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2828\" data-end=\"2942\"\u003e\n\u003cp data-start=\"2830\" data-end=\"2942\"\u003e\u003cstrong data-start=\"2830\" data-end=\"2851\"\u003eTrivalent plating\u003c\/strong\u003e for anti-corrosion \/ anti-seize shell protection \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2943\" data-end=\"3096\"\u003e\n\u003cp data-start=\"2945\" data-end=\"3096\"\u003e\u003cstrong data-start=\"2945\" data-end=\"2967\"\u003eDirect replacement\u003c\/strong\u003e for bikes that specify BPR5EIX (or same dimensions\/heat range as per manual\/NGK chart) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3097\" data-end=\"3194\"\u003e\n\u003cp data-start=\"3099\" data-end=\"3194\"\u003eUnder The Hood support: share bike variant + old plug photo, we’ll help confirm before shipping\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3196\" data-end=\"3199\"\u003e\n\u003ch2 data-start=\"3201\" data-end=\"3233\"\u003eTECHNICAL SPECIFICATIONS\u003c\/h2\u003e\n\u003cul data-start=\"3234\" data-end=\"4309\"\u003e\n\u003cli data-start=\"3234\" data-end=\"3292\"\u003e\n\u003cp data-start=\"3236\" data-end=\"3292\"\u003e\u003cstrong data-start=\"3236\" data-end=\"3246\"\u003eBrand:\u003c\/strong\u003e NGK \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3293\" data-end=\"3361\"\u003e\n\u003cp data-start=\"3295\" data-end=\"3361\"\u003e\u003cstrong data-start=\"3295\" data-end=\"3311\"\u003ePart Number:\u003c\/strong\u003e BPR5EIX \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3362\" data-end=\"3432\"\u003e\n\u003cp data-start=\"3364\" data-end=\"3432\"\u003e\u003cstrong data-start=\"3364\" data-end=\"3385\"\u003eNGK Stock Number:\u003c\/strong\u003e 6597 \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3433\" data-end=\"3506\"\u003e\n\u003cp data-start=\"3435\" data-end=\"3506\"\u003e\u003cstrong data-start=\"3435\" data-end=\"3453\"\u003eSeries \/ Type:\u003c\/strong\u003e Iridium IX \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3507\" data-end=\"3595\"\u003e\n\u003cp data-start=\"3509\" data-end=\"3595\"\u003e\u003cstrong data-start=\"3509\" data-end=\"3537\"\u003eThread Diameter \/ Pitch:\u003c\/strong\u003e 14 mm \/ 1.25 mm \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3596\" data-end=\"3663\"\u003e\n\u003cp data-start=\"3598\" data-end=\"3663\"\u003e\u003cstrong data-start=\"3598\" data-end=\"3608\"\u003eReach:\u003c\/strong\u003e 19 mm (3\/4\") \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3664\" data-end=\"3759\"\u003e\n\u003cp data-start=\"3666\" data-end=\"3759\"\u003e\u003cstrong data-start=\"3666\" data-end=\"3680\"\u003eSeat Type:\u003c\/strong\u003e Flat seat with gasket (crush washer) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3760\" data-end=\"3834\"\u003e\n\u003cp data-start=\"3762\" data-end=\"3834\"\u003e\u003cstrong data-start=\"3762\" data-end=\"3775\"\u003eHex Size:\u003c\/strong\u003e 20.8 mm (13\/16\") \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3835\" data-end=\"3908\"\u003e\n\u003cp data-start=\"3837\" data-end=\"3908\"\u003e\u003cstrong data-start=\"3837\" data-end=\"3852\"\u003eHeat Range:\u003c\/strong\u003e 5 (NGK scale) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3909\" data-end=\"3976\"\u003e\n\u003cp data-start=\"3911\" data-end=\"3976\"\u003e\u003cstrong data-start=\"3911\" data-end=\"3924\"\u003eResistor:\u003c\/strong\u003e Yes (5kΩ) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3977\" data-end=\"4084\"\u003e\n\u003cp data-start=\"3979\" data-end=\"4084\"\u003e\u003cstrong data-start=\"3979\" data-end=\"3995\"\u003eFactory Gap:\u003c\/strong\u003e 0.8 mm (listed by multiple retailers for 6597) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4085\" data-end=\"4178\"\u003e\n\u003cp data-start=\"4087\" data-end=\"4178\"\u003e\u003cstrong data-start=\"4087\" data-end=\"4108\"\u003eCenter Electrode:\u003c\/strong\u003e Iridium fine wire (~0.6 mm) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"4179\" data-end=\"4309\"\u003e\n\u003cp data-start=\"4181\" data-end=\"4309\"\u003e\u003cstrong data-start=\"4181\" data-end=\"4203\"\u003eCountry of Origin:\u003c\/strong\u003e — not clearly specified consistently in reliable official sources in the pages retrieved (avoid guessing)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4311\" data-end=\"4314\"\u003e\n\u003ch2 data-start=\"4316\" data-end=\"4345\"\u003eCOMPATIBILITY SECTION\u003c\/h2\u003e\n\u003ch3 data-start=\"4347\" data-end=\"4473\"\u003ea) \u003cstrong data-start=\"4354\" data-end=\"4385\"\u003eConfirmed Compatible Models\u003c\/strong\u003e (from NGK India 2W Iridium application chart) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"4475\" data-end=\"5330\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"4475\" data-end=\"4540\"\u003e\n\u003ctr data-start=\"4475\" data-end=\"4540\"\u003e\n\u003cth data-start=\"4475\" data-end=\"4483\" data-col-size=\"sm\" class=\"\"\u003eBrand\u003c\/th\u003e\n\u003cth data-start=\"4483\" data-end=\"4491\" data-col-size=\"md\" class=\"\"\u003eModel\u003c\/th\u003e\n\u003cth data-start=\"4491\" data-end=\"4511\" data-col-size=\"sm\" class=\"\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"4511\" data-end=\"4522\" data-col-size=\"sm\" class=\"\"\u003eBS Stage\u003c\/th\u003e\n\u003cth data-start=\"4522\" data-end=\"4531\" data-col-size=\"sm\" class=\"\"\u003eYears*\u003c\/th\u003e\n\u003cth data-start=\"4531\" data-end=\"4540\" data-col-size=\"md\" class=\"\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"4567\" data-end=\"5330\"\u003e\n\u003ctr data-start=\"4567\" data-end=\"4669\"\u003e\n\u003ctd data-start=\"4567\" data-end=\"4583\" data-col-size=\"sm\"\u003eRoyal Enfield\u003c\/td\u003e\n\u003ctd data-start=\"4583\" data-end=\"4597\" data-col-size=\"md\"\u003eClassic 350\u003c\/td\u003e\n\u003ctd data-start=\"4597\" data-end=\"4607\" data-col-size=\"sm\"\u003eUCE 350\u003c\/td\u003e\n\u003ctd data-start=\"4607\" data-end=\"4638\" data-col-size=\"sm\"\u003eBS6 (as listed in NGK chart)\u003c\/td\u003e\n\u003ctd data-start=\"4638\" data-end=\"4642\" data-col-size=\"sm\"\u003e—\u003c\/td\u003e\n\u003ctd data-start=\"4642\" data-end=\"4669\" data-col-size=\"md\"\u003eChart lists \u003cstrong data-start=\"4656\" data-end=\"4667\"\u003eBPR5EIX\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4670\" data-end=\"4790\"\u003e\n\u003ctd data-start=\"4670\" data-end=\"4686\" data-col-size=\"sm\"\u003eRoyal Enfield\u003c\/td\u003e\n\u003ctd data-start=\"4686\" data-end=\"4731\" data-col-size=\"md\"\u003eBullet 350 (ABS Single Channel) \/ 350KS\/ES\u003c\/td\u003e\n\u003ctd data-start=\"4731\" data-end=\"4741\" data-col-size=\"sm\"\u003eUCE 350\u003c\/td\u003e\n\u003ctd data-start=\"4741\" data-end=\"4759\" data-col-size=\"sm\"\u003eBS6 (as listed)\u003c\/td\u003e\n\u003ctd data-start=\"4759\" data-end=\"4763\" data-col-size=\"sm\"\u003e—\u003c\/td\u003e\n\u003ctd data-start=\"4763\" data-end=\"4790\" data-col-size=\"md\"\u003eChart lists \u003cstrong data-start=\"4777\" data-end=\"4788\"\u003eBPR5EIX\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"4791\" data-end=\"4999\"\u003e\n\u003ctd data-start=\"4791\" data-end=\"4807\" data-col-size=\"sm\"\u003eRoyal Enfield\u003c\/td\u003e\n\u003ctd data-start=\"4807\" data-end=\"4885\" data-col-size=\"md\"\u003eClassic 350 \/ Bullet \/ Thunderbird 350 \/ 350X \/ Trials (UCE twin-spark set)\u003c\/td\u003e\n\u003ctd data-start=\"4885\" data-end=\"4906\" data-col-size=\"sm\"\u003eUCE 350 Twin Spark\u003c\/td\u003e\n\u003ctd data-start=\"4906\" data-end=\"4928\" data-col-size=\"sm\"\u003eBS3–BS4 (as listed)\u003c\/td\u003e\n\u003ctd data-start=\"4928\" data-end=\"4932\" data-col-size=\"sm\"\u003e—\u003c\/td\u003e\n\u003ctd data-start=\"4932\" data-end=\"4999\" data-col-size=\"md\"\u003eChart shows \u003cstrong data-start=\"4946\" data-end=\"4971\"\u003eBPR5EIX + CPR6EAIX-9S\u003c\/strong\u003e set (two different plugs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"5000\" data-end=\"5162\"\u003e\n\u003ctd data-start=\"5000\" data-end=\"5016\" data-col-size=\"sm\"\u003eRoyal Enfield\u003c\/td\u003e\n\u003ctd data-start=\"5016\" data-end=\"5074\" data-col-size=\"md\"\u003eClassic \/ Bullet \/ Thunderbird 500 (UCE twin-spark set)\u003c\/td\u003e\n\u003ctd data-start=\"5074\" data-end=\"5095\" data-col-size=\"sm\"\u003eUCE 500 Twin Spark\u003c\/td\u003e\n\u003ctd data-start=\"5095\" data-end=\"5113\" data-col-size=\"sm\"\u003eBS3 (as listed)\u003c\/td\u003e\n\u003ctd data-start=\"5113\" data-end=\"5117\" data-col-size=\"sm\"\u003e—\u003c\/td\u003e\n\u003ctd data-start=\"5117\" data-end=\"5162\" data-col-size=\"md\"\u003eChart shows \u003cstrong data-start=\"5131\" data-end=\"5156\"\u003eBPR5EIX + CPR6EAIX-9S\u003c\/strong\u003e set\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"5163\" data-end=\"5330\"\u003e\n\u003ctd data-start=\"5163\" data-end=\"5179\" data-col-size=\"sm\"\u003eRoyal Enfield\u003c\/td\u003e\n\u003ctd data-start=\"5179\" data-end=\"5262\" data-col-size=\"md\"\u003eThunderbird 500 \/ 500X, Classic 500 (ABS), Bullet Trials\/ABS, Continental GT 535\u003c\/td\u003e\n\u003ctd data-start=\"5262\" data-end=\"5281\" data-col-size=\"sm\"\u003eUCE 500 \/ GT 535\u003c\/td\u003e\n\u003ctd data-start=\"5281\" data-end=\"5299\" data-col-size=\"sm\"\u003eBS4 (as listed)\u003c\/td\u003e\n\u003ctd data-start=\"5299\" data-end=\"5303\" data-col-size=\"sm\"\u003e—\u003c\/td\u003e\n\u003ctd data-start=\"5303\" data-end=\"5330\" data-col-size=\"md\"\u003eChart lists \u003cstrong data-start=\"5317\" data-end=\"5328\"\u003eBPR5EIX\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"5332\" data-end=\"5439\"\u003e*NGK chart doesn’t provide exact year ranges; verify by platform (UCE vs newer platforms) before ordering.\u003c\/p\u003e\n\u003cp data-start=\"5489\" data-end=\"5723\"\u003e\u003cspan style=\"color: rgb(249, 1, 1);\"\u003e\u003cstrong\u003eONLY FOR UCE MODEL \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-start=\"5725\" data-end=\"5771\"\u003e\u003cstrong data-start=\"5732\" data-end=\"5769\"\u003eNot Compatible \/ Common Confusion\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul data-start=\"5772\" data-end=\"5966\"\u003e\n\u003cli data-start=\"5772\" data-end=\"5966\"\u003e\n\u003cp data-start=\"5774\" data-end=\"5966\"\u003e\u003cstrong data-start=\"5774\" data-end=\"5826\"\u003eDo not buy only 1 plug for UCE Twin-Spark models\u003c\/strong\u003e if your bike requires the \u003cstrong data-start=\"5853\" data-end=\"5875\"\u003e2-plug combination\u003c\/strong\u003e (BPR5EIX + CPR6EAIX-9S) as shown in NGK’s chart. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"5968\" data-end=\"5971\"\u003e\n\u003ch2 data-start=\"5973\" data-end=\"6005\"\u003eVARIANTS \u003c\/h2\u003e\n\u003cp data-start=\"6006\" data-end=\"6059\"\u003e\u003cstrong data-start=\"6006\" data-end=\"6057\"\u003eRecommended Shopify variants (high-conversion):\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"6060\" data-end=\"6361\"\u003e\n\u003cli data-start=\"6060\" data-end=\"6149\"\u003e\n\u003cp data-start=\"6062\" data-end=\"6149\"\u003e\u003cstrong data-start=\"6062\" data-end=\"6084\"\u003eSingle Plug (1 pc)\u003c\/strong\u003e – for bikes that use only BPR5EIX (or for replacing one plug).\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"6150\" data-end=\"6361\"\u003e\n\u003cp data-start=\"6152\" data-end=\"6361\"\u003e\u003cstrong data-start=\"6152\" data-end=\"6180\"\u003eTwin Spark Set (2 plugs)\u003c\/strong\u003e – for UCE twin-spark bikes that need the combo \u003cstrong data-start=\"6228\" data-end=\"6253\"\u003eBPR5EIX + CPR6EAIX-9S\u003c\/strong\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"6363\" data-end=\"6366\"\u003e\n\u003ch2 data-start=\"6368\" data-end=\"6393\"\u003eWHAT’S IN THE BOX\u003c\/h2\u003e\n\u003cul data-start=\"6394\" data-end=\"6529\"\u003e\n\u003cli data-start=\"6394\" data-end=\"6529\"\u003e\n\u003cp data-start=\"6396\" data-end=\"6529\"\u003e\u003cstrong data-start=\"6396\" data-end=\"6444\"\u003e1 × NGK BPR5EIX (6597) Iridium IX Spark Plug\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003cbr data-start=\"6484\" data-end=\"6487\"\u003e\u003cem data-start=\"6487\" data-end=\"6529\"\u003e(No extra washers\/boots\/tools included.)\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"6531\" data-end=\"6534\"\u003e\n\u003ch2 data-start=\"6536\" data-end=\"6577\"\u003eINSTALLATION \u0026amp; MAINTENANCE NOTES\u003c\/h2\u003e\n\u003cul data-start=\"6578\" data-end=\"7162\"\u003e\n\u003cli data-start=\"6578\" data-end=\"6655\"\u003e\n\u003cp data-start=\"6580\" data-end=\"6655\"\u003eInstall on a cool engine; start threads by hand to avoid cross-threading.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"6656\" data-end=\"6829\"\u003e\n\u003cp data-start=\"6658\" data-end=\"6829\"\u003e\u003cstrong data-start=\"6658\" data-end=\"6688\"\u003eDo not aggressively re-gap\u003c\/strong\u003e iridium fine-wire plugs—if you must verify gap, do it carefully without prying on the iridium tip. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"6830\" data-end=\"7022\"\u003e\n\u003cp data-start=\"6832\" data-end=\"7022\"\u003eUse correct torque for gasket-seat plugs; over-tightening can damage threads\/head. (If you need exact torque for your model, follow service manual.) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"7023\" data-end=\"7162\"\u003e\n\u003cp data-start=\"7025\" data-end=\"7162\"\u003eIf your bike is twin-spark UCE: confirm whether it needs the \u003cstrong data-start=\"7086\" data-end=\"7100\"\u003e2-plug set\u003c\/strong\u003e shown by NGK chart. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"7164\" data-end=\"7167\"\u003e\n\u003ch2 data-start=\"7169\" data-end=\"7185\"\u003eFAQ\u003c\/h2\u003e\n\u003cp data-start=\"7187\" data-end=\"7477\"\u003e\u003cstrong data-start=\"7187\" data-end=\"7244\"\u003e1) Will NGK BPR5EIX fit my Royal Enfield Classic 350?\u003c\/strong\u003e\u003cbr data-start=\"7244\" data-end=\"7247\"\u003eIt is listed in NGK India’s 2W Iridium chart for \u003cstrong data-start=\"7296\" data-end=\"7327\"\u003eClassic 350 (BS6 as listed)\u003c\/strong\u003e and also for several UCE 350\/500 applications. Use the compatibility table above and confirm your platform. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"7479\" data-end=\"7737\"\u003e\u003cstrong data-start=\"7479\" data-end=\"7540\"\u003e2) My bike is UCE Twin Spark—do I need 1 plug or 2 plugs?\u003c\/strong\u003e\u003cbr data-start=\"7540\" data-end=\"7543\"\u003eMany UCE twin-spark setups require \u003cstrong data-start=\"7578\" data-end=\"7601\"\u003etwo different plugs\u003c\/strong\u003e. NGK’s chart shows \u003cstrong data-start=\"7621\" data-end=\"7646\"\u003eBPR5EIX + CPR6EAIX-9S\u003c\/strong\u003e for certain UCE 350\/500 twin-spark applications. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"7739\" data-end=\"8020\"\u003e\u003cstrong data-start=\"7739\" data-end=\"7805\"\u003e3) Is this an upgrade over the regular BPR5ES \/ standard plug?\u003c\/strong\u003e\u003cbr data-start=\"7805\" data-end=\"7808\"\u003eYes—BPR5EIX is Iridium IX with a fine-wire iridium center electrode designed for stable spark and longer consistency vs standard nickel plugs (maintenance still matters). \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"8022\" data-end=\"8223\"\u003e\u003cstrong data-start=\"8022\" data-end=\"8070\"\u003e4) What are the key specs of BPR5EIX (6597)?\u003c\/strong\u003e\u003cbr data-start=\"8070\" data-end=\"8073\"\u003e14 mm thread, 19 mm reach, gasket seat, resistor type, heat range 5, factory gap typically listed as 0.8 mm. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"8225\" data-end=\"8462\"\u003e\u003cstrong data-start=\"8225\" data-end=\"8258\"\u003e5) Will this improve mileage?\u003c\/strong\u003e\u003cbr data-start=\"8258\" data-end=\"8261\"\u003eA fresh, correct plug can restore smooth combustion if your old plug was weak\/fouled. Mileage depends more on tuning, riding style, air filter, fuel quality, and tyre pressure—so don’t expect miracles.\u003c\/p\u003e\n\u003cp data-start=\"8464\" data-end=\"8697\"\u003e\u003cstrong data-start=\"8464\" data-end=\"8527\"\u003e6) My bike is Classic 350 Reborn (J-Series). Will this fit?\u003c\/strong\u003e\u003cbr data-start=\"8527\" data-end=\"8530\"\u003eNot confirmed from the NGK chart lines we cited. Best method: match your existing plug code \/ manual. If you share a plug photo, we’ll help you verify before dispatch.\u003c\/p\u003e\n\u003cp data-start=\"8699\" data-end=\"8905\"\u003e\u003cstrong data-start=\"8699\" data-end=\"8751\"\u003e7) Do I need to change plug cap \/ ignition coil?\u003c\/strong\u003e\u003cbr data-start=\"8751\" data-end=\"8754\"\u003eUsually no, unless the cap\/coil is cracked or misfiring. If you still have misfire after plug change, inspect cap, HT lead, coil, and fuel\/air systems.\u003c\/p\u003e\n\u003cp data-start=\"8907\" data-end=\"9127\"\u003e\u003cstrong data-start=\"8907\" data-end=\"8961\"\u003e8) Is this genuine NGK? How do I avoid fake plugs?\u003c\/strong\u003e\u003cbr data-start=\"8961\" data-end=\"8964\"\u003eBuy from a trusted store, check packaging, print quality, and plug markings. Under The Hood sources through reliable channels and packs to avoid damage in transit.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":51022802583847,"sku":null,"price":850.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/B6F5119E-B8BE-4F3D-90E0-03D678DADA4F.jpg?v=1771397648","url":"https:\/\/underthehood.co.in\/products\/ngk-bpr5eix-6597-iridium-spark-plug-royal-enfield-classic-350-uce","provider":"UNDER THE HOOD","version":"1.0","type":"link"}