{"product_id":"johnson-evinrude-ignition-trigger-sensor-timer-base-replaces-oem-583387-585072-584716-fits-1977-2005-4-60-hp-outboards-sierra-18-99398","title":"Sierra 18-99398 Johnson Evinrude Trigger Sensor, 2 Cylinder, Replaces 585072, 584716, 583387","description":"\u003cp\u003eThe Sierra 18-99398 is a trigger sensor for Johnson\/Evinrude 2 cylinder outboard engines, serving as a key component of the ignition system that signals the ignition module to fire the spark at the correct point in the engine cycle. Accurate triggering is essential for smooth idling, reliable starting, and consistent power delivery, and a worn or failing trigger sensor is a common cause of hard starting, misfiring, or intermittent ignition faults on these outboards. This unit is built as a direct equivalent to the original Johnson\/Evinrude trigger assembly, matching the mounting and electrical function of the OEM part it replaces. It is constructed with a metal housing for durability in the marine engine environment and is sized to fit within the compact footprint of the original component. The sensor is intended as a straightforward replacement for boat owners and marine technicians servicing older Johnson\/Evinrude 2 cylinder outboards covering the 4 to 60 HP range, restoring correct ignition timing without requiring modification of the surrounding wiring harness or ignition module. Because ignition timing components vary across engine years and cylinder counts, buyers should confirm their engine's cylinder configuration and horsepower rating against the fitment details below before ordering.\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 18-99398\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Ignition Trigger Sensor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Johnson\/Evinrude 2 cylinder outboards, 1977-2005, 4 to 60 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 1 inch D x 1 inch W x 1 inch H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.1 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394318\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 2 cylinder outboards, 1977-2005, 4 to 60 HP\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e585072\u003c\/li\u003e\n\u003cli\u003e584716\u003c\/li\u003e\n\u003cli\u003e583387\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99398 trigger sensor do?\u003c\/strong\u003e The Sierra 18-99398 is an ignition trigger sensor that signals the ignition module on Johnson\/Evinrude 2 cylinder outboards to fire the spark at the correct point in the engine cycle, which is essential for reliable starting and smooth running.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99398 fit?\u003c\/strong\u003e This trigger sensor fits Johnson\/Evinrude 2 cylinder outboard engines in the 4 to 60 HP range, covering model years 1977-2005.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-99398 replace?\u003c\/strong\u003e It replaces Johnson\/Evinrude OEM part numbers 585072, 584716, and 583387.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99398 designed for 2 cylinder engines specifically?\u003c\/strong\u003e Yes, the Sierra 18-99398 is built for Johnson\/Evinrude 2 cylinder outboard applications; buyers should confirm their engine's cylinder count before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the trigger sensor made of?\u003c\/strong\u003e The Sierra 18-99398 trigger sensor has a metal housing, chosen for durability in the marine ignition system environment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the Sierra 18-99398?\u003c\/strong\u003e The unit measures 1 inch deep by 1 inch wide by 1 inch high, sized to fit within the original trigger sensor's mounting location.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99398 trigger sensor weigh?\u003c\/strong\u003e It weighs 0.1 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99398 an OEM part or an aftermarket equivalent?\u003c\/strong\u003e It is a Sierra-branded aftermarket replacement engineered to match the fit and function of the original Johnson\/Evinrude trigger sensor it replaces (585072, 584716, 583387), not a part sourced from Johnson\/Evinrude.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-99398 myself?\u003c\/strong\u003e The Sierra 18-99398 is designed as a direct replacement for the original Johnson\/Evinrude trigger sensor, so it installs in the same location and connects to the existing ignition wiring without modification.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-99398?\u003c\/strong\u003e You receive one Sierra 18-99398 trigger sensor unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the 18-99398 compare to the original Johnson\/Evinrude trigger sensor?\u003c\/strong\u003e The 18-99398 is intended to function as a drop-in equivalent to OEM numbers 585072, 584716, and 583387, matching the mounting and electrical role of the original part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-99398 work on a 4 to 60 HP outboard from any model year?\u003c\/strong\u003e The Sierra 18-99398 is confirmed for Johnson\/Evinrude 2 cylinder outboards spanning the 1977-2005 model years within the 4 to 60 HP range; engines outside that span or cylinder count should be checked against the listed OEM cross-reference numbers first.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988443017435,"sku":"SIE-18-99398","price":52.31,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-133-3387_lg__70183.1558111567.500.750.jpg?v=1785188349","url":"https:\/\/www.goodvibesmarina.com\/products\/johnson-evinrude-ignition-trigger-sensor-timer-base-replaces-oem-583387-585072-584716-fits-1977-2005-4-60-hp-outboards-sierra-18-99398","provider":"Good Vibes Marina","version":"1.0","type":"link"}