{"product_id":"denso-4228-spark-plug","title":"Denso 4228 Spark Plug","description":"\u003ch2\u003eU-Groove Spark Plug Overview\u003c\/h2\u003e\u003cp\u003eThe Denso 4228 spark plug is a U-Groove Conventional ignition component built for direct engine service. It uses a U-groove ground electrode design to improve ignitability and support more efficient combustion.\u003c\/p\u003e\u003cp\u003eFits 2006-2007 Victory Hammer, N\/A. This Denso spark plug is identified by part number 4228 and cross-references Denso Auto Parts U20EPR9 for the same application.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eU-groove design promotes stronger spark exposure for improved ignitability.\u003c\/li\u003e\n\u003cli\u003eCopper core center electrode helps conduct heat efficiently.\u003c\/li\u003e\n\u003cli\u003eNickel center and ground electrode tip materials support stable spark performance.\u003c\/li\u003e\n\u003cli\u003eStandard ground configuration and standard tip design for conventional ignition service.\u003c\/li\u003e\n\u003cli\u003e0.9 pre-gap, 14 mm thread diameter, 19 mm reach, and 16 mm hex size.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThe Denso 4228 is part of the U-Groove Conventional line, a spark plug family focused on reliable ignition performance in standard replacement applications. Its U-groove ground electrode shape increases the spark path exposure, which helps the air-fuel mixture ignite more consistently. With a copper core center electrode, nickel tip materials, and a 5000 ohm resistor, this plug is built for controlled spark delivery and stable operation. For riders searching for a Victory Hammer spark plug or a Denso 4228 replacement, this part matches the listed fitment and specifications.\u003c\/p\u003e\u003cp\u003eUse this spark plug when servicing ignition systems that require the specified thread diameter, reach, seat type, and heat range. The Denso 4228 is a practical choice for maintaining proper combustion characteristics in the 2006-2007 Victory Hammer, and the U-Groove Conventional design reflects Denso’s focus on ignition efficiency.\u003c\/p\u003e\u003ch2\u003eCommon Issues It Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHard starting caused by worn or inefficient spark plugs.\u003c\/li\u003e\n\u003cli\u003eRough idle from inconsistent ignition performance.\u003c\/li\u003e\n\u003cli\u003eMisfire conditions related to degraded electrode surfaces.\u003c\/li\u003e\n\u003cli\u003eReduced fuel burn efficiency from weak spark delivery.\u003c\/li\u003e\n\u003cli\u003eService replacement needs for the specified ignition setup.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify thread diameter, reach, seat type, and pre-gap before installation. Confirm the ignition system specification for the 2006-2007 Victory Hammer and follow the manufacturer’s service procedure for torque and gap handling. Inspect the old plug for signs of fouling or abnormal wear to help identify underlying engine issues.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eDenso is an established ignition component manufacturer, and the U-Groove Conventional line is engineered around improved ignitability and efficient combustion support. Part number 4228 is built to the listed specifications for consistent replacement service.\u003c\/p\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":53604146217141,"sku":"BBNF-4228","price":15.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NP_4228_Fro.jpg?v=1792998913","url":"https:\/\/www.partcatalog.com\/products\/denso-4228-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}