{"product_id":"rpm-limiter-for-mercury-mariner-2-3-4-cylinder-2-stroke-outboards-and-sportjet-1992-2006-5800-rpm-replaces-oem-821889a52-sierra-18-99257","title":"Sierra RPM Limiter 18-99257 for Mercury\/Mariner 2-Stroke Outboards, 1992-2006, Replaces 821889A36, 5800 RPM","description":"\u003cp\u003eThe Sierra 18-99257 RPM Limiter is an ignition component for Mercury and Mariner 2-stroke outboards and SportJet engines that require a 5800 RPM operating limit. It installs into the existing ignition circuit to cap engine speed at the factory-specified threshold, protecting the powerhead from over-revving during operation. This is a direct-fit replacement designed to restore the RPM-limiting function on engines covering model years 1992 through 2006.\u003c\/p\u003e\u003cp\u003eThe RPM limiter is a compact electronic module wired into the outboard's ignition system. When engine speed approaches the 5800 RPM ceiling, it intervenes to prevent the engine from exceeding that limit, which helps guard against mechanical damage from sustained over-revving. It is a straightforward swap for the original factory unit, using the same electrical interface so no rewiring or ECU changes are needed.\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 18-99257\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury\/Mariner 2-stroke outboards and SportJet engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPM Limit:\u003c\/strong\u003e 5800 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282394196\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner 2-stroke outboards and SportJet engines requiring a 5800 RPM limit, 1992-2006\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e821889A36\u003c\/li\u003e\n\u003cli\u003e821889A52\u003c\/li\u003e\n\u003cli\u003e821889A2\u003c\/li\u003e\n\u003cli\u003e821889A4\u003c\/li\u003e\n\u003cli\u003e821889A6\u003c\/li\u003e\n\u003cli\u003e821889A8\u003c\/li\u003e\n\u003cli\u003e821889A12\u003c\/li\u003e\n\u003cli\u003e821889A14\u003c\/li\u003e\n\u003cli\u003e821889T24\u003c\/li\u003e\n\u003cli\u003e821889A48\u003c\/li\u003e\n\u003cli\u003e821889A44\u003c\/li\u003e\n\u003cli\u003e821889A18\u003c\/li\u003e\n\u003cli\u003e821889A24\u003c\/li\u003e\n\u003cli\u003e821889A31\u003c\/li\u003e\n\u003cli\u003e821889A32\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-99257 RPM Limiter fit?\u003c\/strong\u003e It fits Mercury\/Mariner 2-stroke outboards and SportJet engines built to a 5800 RPM operating limit, covering model years 1992 through 2006.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat RPM does this limiter cap the engine at?\u003c\/strong\u003e The Sierra 18-99257 caps engine speed at 5800 RPM, matching the factory limit for the covered Mercury\/Mariner 2-stroke and SportJet engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-99257 a direct replacement for the factory Mercury part?\u003c\/strong\u003e Yes, it is a direct replacement using the same electrical interface as the original Mercury\/Mariner ignition component, so no wiring or ECU modifications are needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does part 18-99257 replace?\u003c\/strong\u003e It replaces Mercury\/Mariner numbers 821889A36, 821889A52, 821889A2, 821889A4, 821889A6, 821889A8, 821889A12, 821889A14, 821889T24, 821889A48, 821889A44, 821889A18, 821889A24, 821889A31, and 821889A32.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99257 RPM Limiter weigh?\u003c\/strong\u003e This RPM limiter weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this part work on a SportJet engine?\u003c\/strong\u003e Yes, the Sierra 18-99257 is built for SportJet engines that require a 5800 RPM limit, in addition to Mercury\/Mariner 2-stroke outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes installing the 18-99257 require any special tools or programming?\u003c\/strong\u003e No special programming is required; the Sierra 18-99257 wires into the existing ignition circuit in place of the original RPM limiter using the stock connections.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if the RPM limiter fails or is left out?\u003c\/strong\u003e Without a functioning RPM limiter like the Sierra 18-99257, the engine loses its 5800 RPM ceiling and can be run past its designed speed limit, increasing the risk of powerhead damage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99257 compatible with both Mercury and Mariner branded outboards?\u003c\/strong\u003e Yes, part 18-99257 is designed for both Mercury and Mariner 2-stroke outboards sharing the 5800 RPM ignition specification, as well as SportJet engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this part cover a specific year range?\u003c\/strong\u003e The Sierra 18-99257 is specified for engines within the 1992 to 2006 model range that require a 5800 RPM limit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-99257 RPM Limiter?\u003c\/strong\u003e The UPC for this part is 808282394196.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988440428763,"sku":"SIE-18-99257","price":110.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-144-1889-52_lg__75930.1558111269.500.750.jpg?v=1785189019","url":"https:\/\/www.goodvibesmarina.com\/products\/rpm-limiter-for-mercury-mariner-2-3-4-cylinder-2-stroke-outboards-and-sportjet-1992-2006-5800-rpm-replaces-oem-821889a52-sierra-18-99257","provider":"Good Vibes Marina","version":"1.0","type":"link"}