{"product_id":"marine-rpm-limiter-for-mercury-mariner-2-3-4-cyl-2-stroke-sportjet-1992-2006-5200-rpm-sierra-18-99211","title":"Sierra 18-99211 Mercury Mariner RPM Limiter, 5200 RPM, Fits 1992-2006 2\/3\/4-Cylinder 2-Stroke Outboards and SportJet Engines","description":"\u003cp\u003eThe Sierra 18-99211 is an RPM limiter built for Mercury and Mariner outboards, designed to cap engine speed at 5200 RPM to help protect the powerhead from overspeed damage. It is engineered to fit 1992-2006 2-stroke outboards with 2, 3, or 4 cylinders, as well as SportJet engines that require a 5200 RPM limit. The limiter installs into the ignition system and works by cutting spark once the engine reaches the calibrated RPM ceiling, giving operators a built-in safeguard during hard acceleration or when running in conditions where the propeller can spin free of load, such as a cavitating prop or a boat coming out of the water.\u003c\/p\u003e\u003cp\u003eThis is a functional ignition component rather than a cosmetic or accessory part, and correct application depends on matching it to the specific cylinder count and model year range of the outboard. Because RPM limiters are calibrated to a set threshold, always confirm the recommended part number for your exact outboard application before ordering to ensure the limiter matches your engine's required RPM ceiling.\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 18-99211\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercury Outboard Ignition System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRPM Limit:\u003c\/strong\u003e 5200 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.3 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 2 x 4 x 8 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282393809\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury\/Mariner 2-stroke outboards, 2\/3\/4-cylinder, 1992-2006\u003c\/li\u003e\n\u003cli\u003eMercury SportJet engines requiring a 5200 RPM limit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eNo OEM cross-reference numbers listed\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-99211 RPM limiter do?\u003c\/strong\u003e It caps engine speed at 5200 RPM on Mercury and Mariner outboards, cutting spark once the engine reaches that ceiling to help prevent overspeed damage during hard acceleration or prop cavitation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich engines is the 18-99211 designed to fit?\u003c\/strong\u003e This limiter is built for Mercury\/Mariner 2-stroke outboards with 2, 3, or 4 cylinders, as well as Mercury SportJet engines that require a 5200 RPM limit, covering the 1992-2006 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 5200 RPM the exact limit this part is calibrated to?\u003c\/strong\u003e Yes, the Sierra 18-99211 is calibrated to a 5200 RPM cutoff, which is the specific threshold it is designed to enforce on compatible Mercury\/Mariner engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this part fit SportJet engines?\u003c\/strong\u003e Yes, the 18-99211 fits Mercury SportJet engines that require a 5200 RPM limit, in addition to standard 2\/3\/4-cylinder 2-stroke outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-99211 RPM limiter weigh?\u003c\/strong\u003e The Sierra 18-99211 weighs 0.3 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this RPM limiter?\u003c\/strong\u003e The 18-99211 measures 2 x 4 x 8 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if this is the right RPM limiter for my outboard?\u003c\/strong\u003e Confirm your outboard's cylinder count and model year fall within the 1992-2006 range for 2\/3\/4-cylinder 2-stroke Mercury\/Mariner engines, or that your SportJet engine requires a 5200 RPM limit, before ordering the 18-99211.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eAre there OEM cross-reference numbers for the Sierra 18-99211?\u003c\/strong\u003e No OEM cross-reference or replaces numbers are listed for the 18-99211; it is identified by its Sierra part number only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-99211 an ignition system component?\u003c\/strong\u003e Yes, it is part of the ignition system on applicable Mercury\/Mariner outboards, functioning specifically as an RPM-limiting device rather than a coil, module, or trigger.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan this RPM limiter be used on 4-stroke outboards?\u003c\/strong\u003e The Sierra 18-99211 is designed for 2-stroke Mercury\/Mariner outboards and SportJet engines; 4-stroke applications are not listed as compatible.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would a boat need an RPM limiter like the 18-99211?\u003c\/strong\u003e An RPM limiter such as the 18-99211 protects the engine from overspeeding, which can occur when the propeller loses load, such as during cavitation or when the boat is airborne, by cutting spark at the calibrated 5200 RPM ceiling.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988438659291,"sku":"SIE-18-99211","price":84.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/CDI-144-1889-51_lg__54347.1558111210.500.750.jpg?v=1785188321","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-rpm-limiter-for-mercury-mariner-2-3-4-cyl-2-stroke-sportjet-1992-2006-5200-rpm-sierra-18-99211","provider":"Good Vibes Marina","version":"1.0","type":"link"}