{"product_id":"ngk-6630-ur4-spark-plug-replaces-cushman-830931-and-john-deere-am38027-fits-kohler-engines","title":"NGK 6630 UR4 Spark Plug, Replaces Cushman 830931 and John Deere AM38027, Fits Kohler Engines","description":"\u003cp\u003eThe NGK 6630 is a standard nickel spark plug built on NGK's proven OE plating and design, offering reliable ignition performance for small gas engines. The plug carries a corrosion-resistant plating that keeps installation and removal easy over the plug's service life, while the solid copper core delivers strong heat dissipation, conductivity, and a broad heat range so the engine keeps firing cleanly across varying loads and speeds. NGK Standard plugs like the 6630 are an OE cornerstone, and this design has provided decades of dependable use in small engines.\u003c\/p\u003e\u003cp\u003eThis plug uses a semi-surface discharge ground configuration with a nickel ground electrode and a nickel center electrode tip over a copper core, and it carries a 5,000 ohm resistor for suppression. The hex size is 5\/8 inch, matching standard small-engine spark plug sockets. It is a direct fit and cross-reference match for a range of Kohler small gas engines, and it replaces several OEM part numbers from other engine manufacturers. Always check your engine and maintenance manual to confirm this is the correct plug and gap for your equipment, since using the wrong plug can reduce performance, cut fuel economy, or damage the engine.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e NGK\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 6630\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpark Plug Type:\u003c\/strong\u003e UR4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 5,000 ohms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Configuration:\u003c\/strong\u003e Semi-Surface Discharge\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGround Electrode Core Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Core Material:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCenter Electrode Tip Material:\u003c\/strong\u003e Nickel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHex Size:\u003c\/strong\u003e 5\/8 inch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.15 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 087295166307\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e Cushman 830931, John Deere AM38027, ACDelco 41-905, ACDelco CR 45 TS\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eKohler gas engines: 17.0\/KT17, 19.0\/KT19, 21.0\/KT21, 16.0\/MV16, 18.0\/M18, MV18, 20.0\/M20, MV20, OHC\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCushman 830931\u003c\/li\u003e\n\u003cli\u003eJohn Deere AM38027\u003c\/li\u003e\n\u003cli\u003eACDelco 41-905\u003c\/li\u003e\n\u003cli\u003eACDelco CR 45 TS\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the part number for this spark plug?\u003c\/strong\u003e The manufacturer part number is 6630, corresponding to the NGK UR4 standard spark plug design.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this plug replace a Cushman or John Deere spark plug?\u003c\/strong\u003e Yes, the NGK 6630 UR4 spark plug is a direct cross-reference replacement for Cushman 830931 and John Deere AM38027.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this plug compatible with ACDelco part numbers?\u003c\/strong\u003e The NGK 6630 UR4 cross-references to ACDelco 41-905 and ACDelco CR 45 TS, so it can be used in place of either of those ACDelco spark plugs.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat hex size wrench does this spark plug need?\u003c\/strong\u003e The NGK 6630 UR4 has a 5\/8 inch hex size, which matches standard spark plug sockets of that size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the electrical resistance of this spark plug?\u003c\/strong\u003e This plug carries a 5,000 ohm resistor, built into the NGK 6630 UR4 for radio-frequency suppression.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat materials are the electrodes made from?\u003c\/strong\u003e The NGK 6630 UR4 has a nickel ground electrode and a nickel center electrode tip, with a copper center electrode core for heat dissipation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Kohler engines does this spark plug fit?\u003c\/strong\u003e The 6630 fits Kohler gas engines 17.0\/KT17, 19.0\/KT19, 21.0\/KT21, 16.0\/MV16, 18.0\/M18, MV18, 20.0\/M20, MV20, and OHC models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this spark plug weigh?\u003c\/strong\u003e The NGK 6630 UR4 spark plug weighs 0.15 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine NGK spark plug or an aftermarket copy?\u003c\/strong\u003e This is a genuine NGK-manufactured plug, listed under NGK part number 6630 (UR4 type), not a third-party copy.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat ground electrode configuration does this plug use?\u003c\/strong\u003e The 6630 uses a semi-surface discharge ground configuration, which differs from the standard ground design used on some other NGK plug types.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need anti-seize compound when installing this plug?\u003c\/strong\u003e NGK does not list this standard nickel-plated 6630 UR4 plug as trivalent-plated anti-seize-free, so follow your engine manual's anti-seize recommendation for installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if the 6630 is the right plug for my engine?\u003c\/strong\u003e Check your engine and maintenance manual before installing the NGK 6630 UR4, since using the wrong spark plug can reduce performance, lower fuel economy, or damage the engine.\u003c\/p\u003e","brand":"NGK Spark Plugs","offers":[{"title":"Default Title","offer_id":49028254990555,"sku":"NGK-UR4","price":3.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/NGK-UR4-Spark-Plug__19516.1722498944.500.750.jpg?v=1785165245","url":"https:\/\/www.goodvibesmarina.com\/products\/ngk-6630-ur4-spark-plug-replaces-cushman-830931-and-john-deere-am38027-fits-kohler-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}