{"product_id":"sierra-18-99406-timer-base-for-johnson-evinrude-3-cyl-60-75-hp-outboards-replaces-583378-584562","title":"Sierra 18-99406 Timer Base, Replaces 763777, for Johnson\/Evinrude 3 Cylinder 60-75 HP 1979-2001","description":"\u003cp\u003eThe Sierra 18-99406 Timer Base is a direct-fit ignition component for Johnson and Evinrude 3 cylinder outboard engines, built to restore correct spark timing on units that have developed rough idle, misfiring, or hard-starting symptoms tied to a worn or failed timer base assembly. It mounts in place of the factory timer base and interfaces with the engine's ignition trigger system to maintain accurate timing across the RPM range.\u003c\/p\u003e\u003cp\u003eThis timer base is designed for 3 cylinder Johnson and Evinrude outboards rated at 60, 65, 70, and 75 horsepower covering the 1979-2001 production span, and it cross-references to a range of factory part numbers so it can replace an original timer base that has cracked, worn at the follower pin, or lost consistent contact with the timing components. Installers should confirm the horsepower and cylinder count of their specific engine before ordering, since timer bases are not interchangeable across different cylinder configurations.\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 18-99406\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394370\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 8 x 5 x 3 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.9 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder Count:\u003c\/strong\u003e 3 Cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Horsepower:\u003c\/strong\u003e 60, 65, 70, 75 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment Years:\u003c\/strong\u003e 1979-2001\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eJohnson\/Evinrude 3 cylinder outboards: 60, 65, 70, and 75 HP, 1979-2001\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e763777\u003c\/li\u003e\n\u003cli\u003e584562\u003c\/li\u003e\n\u003cli\u003e584269\u003c\/li\u003e\n\u003cli\u003e583378\u003c\/li\u003e\n\u003cli\u003e583131\u003c\/li\u003e\n\u003cli\u003e581949\u003c\/li\u003e\n\u003cli\u003e583060\u003c\/li\u003e\n\u003cli\u003e582724\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99406 timer base fit?\u003c\/strong\u003e The Sierra 18-99406 fits Johnson and Evinrude 3 cylinder outboards rated at 60, 65, 70, and 75 HP built from 1979-2001.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99406 a direct OEM replacement?\u003c\/strong\u003e Yes, part number 18-99406 is designed as a direct replacement for the original factory timer base on the applicable Johnson\/Evinrude 3 cylinder engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does 18-99406 replace?\u003c\/strong\u003e It replaces OEM numbers 763777, 584562, 584269, 583378, 583131, 581949, 583060, and 582724.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this timer base work on a 2 cylinder or 4 cylinder Evinrude?\u003c\/strong\u003e No, the 18-99406 timer base is built for 3 cylinder Johnson\/Evinrude engines only; it is not interchangeable with 2 or 4 cylinder timer base assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99406 timer base weigh?\u003c\/strong\u003e The Sierra 18-99406 timer base weighs 0.9 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-99406 timer base?\u003c\/strong\u003e The unit measures 8 x 5 x 3 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a failed timer base on these outboards?\u003c\/strong\u003e Rough idle, misfiring, or hard starting on a 1979-2001 3 cylinder Johnson\/Evinrude 60-75 HP outboard can point to a worn timer base like the 18-99406 replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-99406 include mounting hardware?\u003c\/strong\u003e The listing covers the timer base assembly itself, part number 18-99406; check your engine's original hardware for reuse during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-99406 on a 65 HP Johnson from the covered years?\u003c\/strong\u003e Yes, the 18-99406 is designed to fit 60, 65, 70, and 75 HP 3 cylinder Johnson\/Evinrude engines within the 1979-2001 range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs professional installation required for the 18-99406 timer base?\u003c\/strong\u003e Installation involves ignition timing components, so buyers unfamiliar with outboard ignition systems on 3 cylinder Johnson\/Evinrude engines should have the 18-99406 installed by a qualified marine technician.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988442722523,"sku":"SIE-18-99406","price":264.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-133-3378_lg__00201.1748364321.500.750.jpg?v=1785188224","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-99406-timer-base-for-johnson-evinrude-3-cyl-60-75-hp-outboards-replaces-583378-584562","provider":"Good Vibes Marina","version":"1.0","type":"link"}