{"product_id":"sierra-18-99455-timer-base-for-johnson-evinrude-3-cylinder-outboards","title":"Sierra Timer Base 18-99455 for Johnson Evinrude 3-Cylinder Outboard Engines","description":"\u003cp\u003eThe Sierra 18-99455 timer base is an ignition system component built for Johnson and Evinrude 3 cylinder outboard engines. The timer base is the rotating ignition timing element that works with the distributor\/trigger assembly to control spark timing across the cylinders, and it is a common wear or failure point in older Johnson\/Evinrude ignition systems, especially when an engine develops intermittent spark, poor idle, or hard-starting symptoms. Replacing a worn or cracked timer base restores correct ignition timing and helps the engine run smoothly across the rev range.\u003c\/p\u003e\u003cp\u003eThis timer base is designed as a direct fit for 3 cylinder Johnson and Evinrude outboard powerheads, making it a straightforward service part for technicians and DIY boat owners performing ignition system maintenance or troubleshooting a no-spark condition. It ships as a standalone timer base component ready to install in place of the original unit.\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 18-99455\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Johnson Evinrude 3 Cylinder outboard engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComponent Type:\u003c\/strong\u003e Ignition timer base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.8 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282395377\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Johnson and Evinrude 3 cylinder outboard engines.\u003c\/p\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99455 timer base fit?\u003c\/strong\u003e The Sierra 18-99455 timer base is designed for Johnson and Evinrude 3 cylinder outboard engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat does a timer base do in an outboard ignition system?\u003c\/strong\u003e The timer base rotates to control ignition timing across the cylinders, working with the engine's distributor or trigger assembly to fire the spark at the correct point in each cylinder's cycle.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99455 timer base weigh?\u003c\/strong\u003e It weighs 0.8 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are signs that a timer base needs to be replaced?\u003c\/strong\u003e Intermittent spark, hard starting, rough idle, or inconsistent ignition timing on a Johnson or Evinrude 3 cylinder engine can point to a worn or cracked timer base like the Sierra 18-99455.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99455 a direct-fit replacement part?\u003c\/strong\u003e Yes, the Sierra 18-99455 timer base is built to fit in place of the original timer base on applicable Johnson Evinrude 3 cylinder outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-99455 include mounting hardware or other ignition parts?\u003c\/strong\u003e The Sierra 18-99455 is supplied as the timer base component itself; it does not include a distributor cap, points, or trigger assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this timer base be used on 4 or 6 cylinder Johnson Evinrude engines?\u003c\/strong\u003e No, the Sierra 18-99455 is specified for 3 cylinder Johnson and Evinrude outboard engines only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra a trusted brand for outboard ignition parts?\u003c\/strong\u003e Sierra is a long-established manufacturer of marine engine parts, and the 18-99455 timer base is one of its ignition components for Johnson Evinrude 3 cylinder outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-99455 timer base?\u003c\/strong\u003e The UPC for the Sierra 18-99455 timer base is 808282395377.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would a timer base cause an outboard to run poorly on only some cylinders?\u003c\/strong\u003e Because the timer base coordinates spark timing to each cylinder in sequence, a worn or damaged unit like the one the Sierra 18-99455 replaces can cause uneven firing and rough running on a 3 cylinder Johnson or Evinrude engine.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988444655835,"sku":"SIE-18-99455","price":213.56,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-133-4558_lg__58671.1558112025.500.750.jpg?v=1785188122","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99455-timer-base-for-johnson-evinrude-3-cylinder-outboards","provider":"Good Vibes Marina","version":"1.0","type":"link"}