{"product_id":"champion-ql78yc-marine-spark-plug-938m-4-pack-long-reach-4-stroke-outboard-24-ql78yc","title":"Champion QL78YC Marine Spark Plug | #938M | 4-Pack | Long-Reach 4-Stroke Outboard","description":"\u003ch2\u003eLong-Reach Marine Spark Plug for 4-Stroke Outboards — 4-Pack.\u003c\/h2\u003e\u003cp\u003eThe Champion QL78YC is a long-reach, projected-tip marine spark plug designed for 4-stroke outboard engines. Part number 938M, the YC-series features a standard ground electrode with a projected tip for improved ignitability and a built-in resistor to suppress radio frequency interference — making it well-suited for use near marine electronics and communication equipment.\u003c\/p\u003e\u003cp\u003eThe QL-series long-reach thread is engineered for outboard combustion chambers that require deeper plug engagement than standard-reach plugs. Sold in a 4-pack (Champion part 12217). Always verify fitment against your engine's owner's manual or Champion application guide before ordering.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChampion QL78YC marine spark plug — 4-pack (Champion #938M)\u003c\/li\u003e\n\u003cli\u003eLong-reach QL-series thread — for outboard engines requiring deeper plug engagement\u003c\/li\u003e\n\u003cli\u003eProjected tip for improved ignitability and combustion efficiency\u003c\/li\u003e\n\u003cli\u003eStandard ground electrode with resistor construction for RFI suppression\u003c\/li\u003e\n\u003cli\u003eDesigned for 4-stroke marine outboard applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEvinrude and Johnson 4-stroke outboard engines specifying Champion QL78YC or equivalent\u003c\/li\u003e\n\u003cli\u003eMercury and Mariner 4-stroke outboard engines specifying Champion QL78YC or equivalent\u003c\/li\u003e\n\u003cli\u003eLong-reach 4-stroke outboard applications cross-referencing Champion #938M or part 12217\u003c\/li\u003e\n\u003cli\u003eVerify fitment using your engine's owner's manual or the Champion spark plug application guide\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe QL78YC is the standard single-ground-electrode alternative to the \u003ca href=\"\/products\/champion-ql77jc4-marine-spark-plug-828m-4-pack-mercury-4-stroke-24-ql77jc4\"\u003eChampion QL77JC4\u003c\/a\u003e in the long-reach QL family. If your engine specifies the QL78YC, use the QL78YC — the YC and JC4 are not interchangeable despite sharing the same QL-series thread reach. The JC4's four-ground-electrode design offers improved spark consistency, but only use it if your engine's manual specifies it or an equivalent.\u003c\/p\u003e\u003cp\u003eAlso available in a shop pack of 24 — see the \u003ca href=\"\/products\/champion-spark-plug-938s-shop-pack-of-24-11969-24-ql78ycsp\"\u003eChampion #938S Shop Pack\u003c\/a\u003e if you're servicing a fleet or stocking up for the season. For other Champion QL-series marine plugs, see the \u003ca href=\"\/products\/champion-ql16v-marine-spark-plug-876m-4-pack-long-reach-2-stroke-outboard-24-ql16v\"\u003eChampion QL16V #876M\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250815139876,"sku":"24-QL78YC","price":11.96,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/24-L76V_730ec781-75c9-4972-bebf-3537da824308.jpg?v=1786510604","url":"https:\/\/marisolmarine.com\/products\/champion-ql78yc-marine-spark-plug-938m-4-pack-long-reach-4-stroke-outboard-24-ql78yc","provider":"Marisol Marine Company","version":"1.0","type":"link"}