{"product_id":"sierra-18-99172-ignition-coil-for-johnson-outboard-engines","title":"Sierra Wire Coil 18-99172 Ignition Coil for Johnson Outboard Engines","description":"\u003cp\u003eThe Sierra Wire Coil, part number 18-99172, is an ignition coil built for Johnson outboard engines. It is designed as a direct component replacement within the ignition system, supplying the spark energy needed for reliable engine starting and running performance. The coil is a compact, lightweight component intended to be installed as part of routine ignition maintenance or when diagnosing a no-spark or weak-spark condition on a Johnson outboard.\u003c\/p\u003e\u003cp\u003eIgnition coils are a common wear item on outboard engines, and replacing a failing coil with a properly specified part like the Sierra 18-99172 helps restore consistent ignition timing and engine reliability. This coil is sold as a standalone wire coil unit for straightforward installation into the existing ignition harness.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-99172\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Wire Coil (Ignition Coil)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson Outboard Ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Johnson outboard engines.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cp\u003eNo OEM cross-reference numbers are specified for this part.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-99172?\u003c\/strong\u003e It is a wire coil, an ignition coil built for Johnson outboard engines, identified by Sierra part number 18-99172.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this coil fit my Johnson outboard?\u003c\/strong\u003e The Sierra 18-99172 is designed for use in Johnson outboard ignition systems; check that your engine's ignition coil matches this part number or its listed application before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-99172 weigh?\u003c\/strong\u003e This ignition coil weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99172 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-99172 is sold under the Sierra brand as part number 18-99172, manufactured to serve as an ignition coil for Johnson outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does an ignition coil do on an outboard engine?\u003c\/strong\u003e An ignition coil, such as the Sierra 18-99172, stores and delivers the electrical energy needed to generate a spark for combustion in the engine's ignition system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre there OEM cross-reference numbers for the 18-99172?\u003c\/strong\u003e No OEM cross-reference or replacement numbers are specified for the Sierra 18-99172 wire coil.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-99172?\u003c\/strong\u003e Ordering the Sierra 18-99172 includes one wire coil unit for installation in a Johnson outboard ignition system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace my outboard's ignition coil?\u003c\/strong\u003e An ignition coil like the Sierra 18-99172 typically needs replacement when an engine shows symptoms of weak spark, misfiring, or failure to start, which are common signs of ignition coil wear.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99172 a direct replacement part?\u003c\/strong\u003e Yes, the 18-99172 is designed as a wire coil replacement for the ignition system on applicable Johnson outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the 18-99172?\u003c\/strong\u003e The 18-99172 falls under Johnson outboard ignition coils, specifically categorized as a wire coil.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988437905627,"sku":"SIE-18-99172","price":12.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/cdi-933-0124_large__76307.1558113125.500.750.jpg?v=1785329193","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99172-ignition-coil-for-johnson-outboard-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}