{"product_id":"harley-440x-spark-plug-rek6yca-hdh31916abw801s","title":"Harley-Davidson X440 Spark Plug (REK6YCA) – Genuine OEM Type – HDH31916ABW801S \/ 31916ABW801S (Mavrick 440)","description":"\u003cp data-start=\"212\" data-end=\"608\"\u003eA weak or worn spark plug is one of the most common reasons for hard starting, rough idle, misfires, poor pickup, and reduced fuel economy—especially in stop-go Indian traffic. This \u003cstrong data-start=\"440\" data-end=\"462\"\u003eREK6YCA Spark Plug\u003c\/strong\u003e is the correct OEM-type replacement used on the \u003cstrong data-start=\"511\" data-end=\"531\"\u003eHero Mavrick 440\u003c\/strong\u003e platform and is engineered for consistent ignition under high heat and load.\u003c\/p\u003e\n\u003cp data-start=\"610\" data-end=\"1166\"\u003eThis listing covers the spark plug referenced as \u003cstrong data-start=\"659\" data-end=\"675\"\u003e31916ABW801S\u003c\/strong\u003e on Hero’s official parts store (marked applicable for \u003cstrong data-start=\"730\" data-end=\"745\"\u003eMAVRICK 440\u003c\/strong\u003e), and it is also commonly circulated in the market with the Harley\/Hero prefix format as \u003cstrong data-start=\"835\" data-end=\"854\"\u003eHDH31916ABW801S\u003c\/strong\u003e for the 440 platform. \u003c\/p\u003e\n\u003cp data-start=\"610\" data-end=\"1166\"\u003e\u003cbr data-start=\"914\" data-end=\"917\"\u003eIf you’re servicing a 440 platform motorcycle, replacing the spark plug at the right interval helps restore smooth cold starts, cleaner combustion, and crisp throttle response—without risking the “wrong plug” issues that happen with generic matches.\u003c\/p\u003e\n\u003cp data-start=\"1168\" data-end=\"1386\"\u003e\u003cstrong data-start=\"1168\" data-end=\"1200\"\u003eWhy buy from Under The Hood:\u003c\/strong\u003e We’re building India’s most accurate \u003cstrong data-start=\"1238\" data-end=\"1285\"\u003eHarley 440X \/ 440 platform spares catalogue\u003c\/strong\u003e, ship safely packed, and can help confirm fitment if you share your VIN\/RC details on WhatsApp\/chat.\u003c\/p\u003e\n\u003chr data-start=\"1490\" data-end=\"1493\"\u003e\n\u003cp data-start=\"1495\" data-end=\"1538\"\u003e\u003cstrong data-start=\"1499\" data-end=\"1536\"\u003eKey Features \u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1539\" data-end=\"2430\"\u003e\n\u003cli data-start=\"1539\" data-end=\"1639\"\u003e\n\u003cp data-start=\"1541\" data-end=\"1639\"\u003e\u003cstrong data-start=\"1541\" data-end=\"1557\"\u003ePart \/ Type:\u003c\/strong\u003e Spark Plug \u003cstrong data-start=\"1569\" data-end=\"1580\"\u003eREK6YCA\u003c\/strong\u003e (Genuine OEM-type)\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1640\" data-end=\"1722\"\u003e\n\u003cp data-start=\"1642\" data-end=\"1722\"\u003e\u003cstrong data-start=\"1642\" data-end=\"1665\"\u003ePart Number (Hero):\u003c\/strong\u003e \u003cstrong data-start=\"1666\" data-end=\"1682\"\u003e31916ABW801S\u003c\/strong\u003e \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1723\" data-end=\"1858\"\u003e\n\u003cp data-start=\"1725\" data-end=\"1858\"\u003e\u003cstrong data-start=\"1725\" data-end=\"1751\"\u003eMarket Reference Code:\u003c\/strong\u003e \u003cstrong data-start=\"1752\" data-end=\"1771\"\u003eHDH31916ABW801S\u003c\/strong\u003e (commonly listed by independent parts sellers) \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1859\" data-end=\"1987\"\u003e\n\u003cp data-start=\"1861\" data-end=\"1987\"\u003e\u003cstrong data-start=\"1861\" data-end=\"1877\"\u003ePrimary Use:\u003c\/strong\u003e Reliable ignition, smoother starting, stable idle, cleaner combustion \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1988\" data-end=\"2126\"\u003e\n\u003cp data-start=\"1990\" data-end=\"2126\"\u003e\u003cstrong data-start=\"1990\" data-end=\"2012\"\u003eOEM quality focus:\u003c\/strong\u003e Designed to handle high temperature\/pressure for long-lasting performance \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2127\" data-end=\"2211\"\u003e\n\u003cp data-start=\"2129\" data-end=\"2211\"\u003e\u003cstrong data-start=\"2129\" data-end=\"2146\"\u003eHelps reduce:\u003c\/strong\u003e Misfire feel, hesitation, weak pickup (when plug is worn\/aged)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2212\" data-end=\"2333\"\u003e\n\u003cp data-start=\"2214\" data-end=\"2333\"\u003e\u003cstrong data-start=\"2214\" data-end=\"2232\"\u003eBest practice:\u003c\/strong\u003e Replace with correct code instead of “similar-looking” plugs (prevents heat-range mismatch issues)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2334\" data-end=\"2430\"\u003e\n\u003cp data-start=\"2336\" data-end=\"2430\"\u003e\u003cstrong data-start=\"2336\" data-end=\"2359\"\u003ePan-India shipping:\u003c\/strong\u003e Secure packing to protect ceramic insulator + electrode during transit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2432\" data-end=\"2435\"\u003e\n\u003cp data-start=\"2437\" data-end=\"2466\"\u003e\u003cstrong data-start=\"2441\" data-end=\"2464\"\u003eCompatibility Table\u003c\/strong\u003e\u003c\/p\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2468\" data-end=\"3090\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2468\" data-end=\"2558\"\u003e\n\u003ctr data-start=\"2468\" data-end=\"2558\"\u003e\n\u003cth data-start=\"2468\" data-end=\"2475\" data-col-size=\"sm\"\u003eMake\u003c\/th\u003e\n\u003cth data-start=\"2475\" data-end=\"2493\" data-col-size=\"sm\"\u003eModel \/ Variant\u003c\/th\u003e\n\u003cth data-start=\"2493\" data-end=\"2513\" data-col-size=\"sm\"\u003eEngine \/ Platform\u003c\/th\u003e\n\u003cth data-start=\"2513\" data-end=\"2531\" data-col-size=\"sm\"\u003eFuel \/ BS Stage\u003c\/th\u003e\n\u003cth data-start=\"2531\" data-end=\"2549\" data-col-size=\"sm\"\u003eYears (Approx.)\u003c\/th\u003e\n\u003cth data-start=\"2549\" data-end=\"2558\" data-col-size=\"xl\"\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2585\" data-end=\"3090\"\u003e\n\u003ctr data-start=\"2585\" data-end=\"2779\"\u003e\n\u003ctd data-start=\"2585\" data-end=\"2592\" data-col-size=\"sm\"\u003eHero\u003c\/td\u003e\n\u003ctd data-start=\"2592\" data-end=\"2621\" data-col-size=\"sm\"\u003eMavrick 440 (All variants)\u003c\/td\u003e\n\u003ctd data-start=\"2621\" data-end=\"2636\" data-col-size=\"sm\"\u003e440 platform\u003c\/td\u003e\n\u003ctd data-start=\"2636\" data-end=\"2642\" data-col-size=\"sm\"\u003eBS6\u003c\/td\u003e\n\u003ctd data-start=\"2642\" data-end=\"2657\" data-col-size=\"sm\"\u003e2024–onwards\u003c\/td\u003e\n\u003ctd data-start=\"2657\" data-end=\"2779\" data-col-size=\"xl\"\u003e\n\u003cstrong data-start=\"2659\" data-end=\"2672\"\u003eConfirmed\u003c\/strong\u003e on Hero official parts listing as “Model Applicable – MAVRICK 440” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2780\" data-end=\"3090\"\u003e\n\u003ctd data-start=\"2780\" data-end=\"2798\" data-col-size=\"sm\"\u003eHarley-Davidson\u003c\/td\u003e\n\u003ctd data-start=\"2798\" data-end=\"2827\" data-col-size=\"sm\"\u003eX440 \/ 440X (All variants)\u003c\/td\u003e\n\u003ctd data-start=\"2827\" data-end=\"2842\" data-col-size=\"sm\"\u003e440 platform\u003c\/td\u003e\n\u003ctd data-start=\"2842\" data-end=\"2848\" data-col-size=\"sm\"\u003eBS6\u003c\/td\u003e\n\u003ctd data-start=\"2848\" data-end=\"2863\" data-col-size=\"sm\"\u003e2023–onwards\u003c\/td\u003e\n\u003ctd data-start=\"2863\" data-end=\"3090\" data-col-size=\"xl\"\u003e\n\u003cstrong data-start=\"2659\" data-end=\"2672\"\u003eConfirmed\u003c\/strong\u003e\u003cbr\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\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=\"3092\" data-end=\"3222\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"3229\" data-end=\"3256\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"3501\" data-end=\"3528\"\u003e\u003cstrong data-start=\"3505\" data-end=\"3526\"\u003eWhat’s in the Box\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3529\" data-end=\"3685\"\u003e\n\u003cli data-start=\"3529\" data-end=\"3685\"\u003e\n\u003cp data-start=\"3531\" data-end=\"3685\"\u003e1 × \u003cstrong data-start=\"3535\" data-end=\"3557\"\u003eSpark Plug REK6YCA\u003c\/strong\u003e (1 piece) \u003cbr data-start=\"3605\" data-end=\"3608\"\u003e\u003cstrong data-start=\"3608\" data-end=\"3625\"\u003eNot included:\u003c\/strong\u003e plug cap, ignition coil, tools, or any “service kit” items.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3687\" data-end=\"3690\"\u003e\n\u003cp data-start=\"3692\" data-end=\"3734\"\u003e\u003cstrong data-start=\"3696\" data-end=\"3732\"\u003eInstallation \u0026amp; Maintenance Notes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"3735\" data-end=\"4086\"\u003e\n\u003cli data-start=\"3735\" data-end=\"3814\"\u003e\n\u003cp data-start=\"3737\" data-end=\"3814\"\u003eInstall on a \u003cstrong data-start=\"3750\" data-end=\"3765\"\u003ecold engine\u003c\/strong\u003e to protect threads and ensure correct seating.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3815\" data-end=\"3902\"\u003e\n\u003cp data-start=\"3817\" data-end=\"3902\"\u003eEnsure the plug area is clean before removal to avoid debris entering the cylinder.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3903\" data-end=\"3989\"\u003e\n\u003cp data-start=\"3905\" data-end=\"3989\"\u003eIf your plug uses a sealing washer, ensure it seats properly; do not cross-thread.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"3990\" data-end=\"4086\"\u003e\n\u003cp data-start=\"3992\" data-end=\"4086\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4088\" data-end=\"4091\"\u003e\n\u003cp data-start=\"4093\" data-end=\"4122\"\u003e\u003cstrong data-start=\"4097\" data-end=\"4120\"\u003eFAQs \u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"4124\" data-end=\"4322\"\u003e\u003cstrong data-start=\"4124\" data-end=\"4170\"\u003eQ1. Is this spark plug genuine \/ OEM type?\u003c\/strong\u003e\u003cbr data-start=\"4170\" data-end=\"4173\"\u003eYes. This is listed as \u003cstrong data-start=\"4196\" data-end=\"4248\"\u003eHarley-Davidson Genuine Spark Plug – REK6YCA (31916ABW801S)\u003c\/strong\u003e \u003c\/p\u003e\n\u003cp data-start=\"4324\" data-end=\"4489\"\u003e\u003cstrong data-start=\"4324\" data-end=\"4361\"\u003eQ2. Will it fit Hero Mavrick 440?\u003c\/strong\u003e\u003cbr data-start=\"4361\" data-end=\"4364\"\u003eYes. The Hero listing explicitly includes \u003cstrong data-start=\"4406\" data-end=\"4421\"\u003eMAVRICK 440\u003c\/strong\u003e under “Model Applicable.” \u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4491\" data-end=\"4795\"\u003e\u003cstrong data-start=\"4491\" data-end=\"4539\"\u003eQ3. Will it fit Harley-Davidson X440 \/ 440X?\u003c\/strong\u003e\u003cbr data-start=\"4539\" data-end=\"4542\"\u003e\u003cstrong data-start=\"4582\" data-end=\"4601\"\u003eHDH31916ABW801S is a c\u003c\/strong\u003e\u003cstrong data-start=\"2659\" data-end=\"2672\"\u003eonfirmed fitment for \u003cstrong data-start=\"4491\" data-end=\"4539\"\u003efit Harley-Davidson X440 \/ 440X.\u003c\/strong\u003e\u003c\/strong\u003e\u003cspan class=\"\" data-state=\"closed\"\u003e\u003cspan class=\"ms-1 inline-flex max-w-full items-center relative top-[-0.094rem] animate-[show_150ms_ease-in]\" data-testid=\"webpage-citation-pill\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-start=\"4797\" data-end=\"4991\"\u003e\u003cstrong data-start=\"4797\" data-end=\"4859\"\u003eQ4. What symptoms suggest my spark plug needs replacement?\u003c\/strong\u003e\u003cbr data-start=\"4859\" data-end=\"4862\"\u003eHard starting, unstable idle, misfire\/jerk under load, weak pickup, or reduced mileage—especially if the plug is old or fouled.\u003c\/p\u003e\n\u003cp data-start=\"4993\" data-end=\"5209\"\u003e\u003cstrong data-start=\"4993\" data-end=\"5052\"\u003eQ5. Can I use a “similar” spark plug from a local shop?\u003c\/strong\u003e\u003cbr data-start=\"5052\" data-end=\"5055\"\u003eNot recommended. Heat range and reach differences can cause performance issues. Using the correct code helps avoid misfires and long-term engine stress.\u003c\/p\u003e\n\u003cp data-start=\"5211\" data-end=\"5388\"\u003e\u003cstrong data-start=\"5211\" data-end=\"5257\"\u003eQ6. Is professional installation required?\u003c\/strong\u003e\u003cbr data-start=\"5257\" data-end=\"5260\"\u003eIf you’re comfortable with basic maintenance, it’s straightforward—but avoid cross-threading. If unsure, use a trained mechanic.\u003c\/p\u003e","brand":"UNDER THE HOOD","offers":[{"title":"Default Title","offer_id":50878530519335,"sku":null,"price":400.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0878\/7447\/0183\/files\/F8086B6C-D2BA-4A14-94B4-B4719E45CB89.jpg?v=1767373884","url":"https:\/\/underthehood.co.in\/products\/harley-440x-spark-plug-rek6yca-hdh31916abw801s","provider":"UNDER THE HOOD","version":"1.0","type":"link"}