{"product_id":"spark-plug-m12u-per-piece-gaz-series-oem-51-3707010","title":"Spark Plug M12U (per piece)- GAZ Series - OEM 51-3707010","description":"\u003cp data-start=\"69\" data-end=\"314\"\u003eThis spark plug fits GAZ Series vehicles and restores crisp, reliable ignition on classic carbureted engines. Supplied per piece, it’s the period-correct M12U type specified in factory catalogs and a direct replacement for tired or fouled plugs.\u003c\/p\u003e\n\u003cp data-start=\"316\" data-end=\"653\"\u003e\u003cstrong data-start=\"316\" data-end=\"347\"\u003eWhy choose this spark plug?\u003c\/strong\u003e\u003cbr\u003eFresh, correct-spec plugs improve cold starts, stabilize idle quality, and reduce misfires under load. Using the proper seat and reach protects cylinder-head threads and ensures a gas-tight seal. If you notice hard starting, sooty deposits, or hesitation, renewing the plugs is a fast, cost-effective fix.\u003c\/p\u003e\n\u003cp data-start=\"655\" data-end=\"885\"\u003e\u003cstrong data-start=\"655\" data-end=\"677\"\u003eTechnical details:\u003c\/strong\u003e\u003cbr\u003eType: M12U spark plug (non-resistor)\u003cbr data-start=\"714\" data-end=\"717\"\u003eSeat: Flat seat with sealing gasket\u003cbr data-start=\"752\" data-end=\"755\"\u003eThread: M18 × 1.5\u003cbr data-start=\"772\" data-end=\"775\"\u003eThread reach: 12 mm\u003cbr data-start=\"794\" data-end=\"797\"\u003eHex size: 20.8 mm (21 mm wrench)\u003cbr data-start=\"829\" data-end=\"832\"\u003eOEM number: 51-3707010 (catalog variant 51-3707010-6)\u003c\/p\u003e\n\u003cp data-start=\"887\" data-end=\"920\"\u003e\u003cstrong data-start=\"887\" data-end=\"909\"\u003eCompatible models:\u003c\/strong\u003e\u003cbr\u003eGAZ Series\u003cbr\u003efor M12Y GAZ69,GAZ67,GAZ46,GAZ51,M20,UAZ450\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-start=\"922\" data-end=\"1202\"\u003e\u003cstrong data-start=\"922\" data-end=\"944\"\u003eInstallation tips:\u003c\/strong\u003e\u003cbr\u003eWork on a cold engine. Clean the plug seats, start threads by hand to avoid cross-threading, and torque to your engine manual’s value for gasketed plugs. Recheck after the first heat cycles. Set the electrode gap to the specification in your vehicle manual.\u003c\/p\u003e\n\u003cp data-start=\"1204\" data-end=\"1448\"\u003e\u003cstrong data-start=\"1204\" data-end=\"1237\"\u003eWhen to replace \/ Why upgrade\u003c\/strong\u003e\u003cbr\u003eReplace if the insulator is cracked, electrodes are rounded, or the engine misfires despite healthy leads and timing. New M12U plugs help restore smooth idle, better throttle response, and reliable cold starts.\u003c\/p\u003e\n\u003cp data-start=\"1450\" data-end=\"1537\"\u003eNot sure if this part fits your vehicle? Feel free to contact us — we’re happy to help.\u003c\/p\u003e","brand":"UAZPARTS.COM","offers":[{"title":"Default Title","offer_id":52181741306199,"sku":"51-3707010","price":14.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0925\/4859\/6055\/files\/Spark-Plug-M12U-per-piece-GAZ-Series-OEM-51-3707010-uaz-spare-parts-1.jpg?v=1780323235","url":"https:\/\/www.uazparts.de\/en\/products\/spark-plug-m12u-per-piece-gaz-series-oem-51-3707010","provider":"UAZPARTS.COM","version":"1.0","type":"link"}