{"product_id":"sierra-9251-outboard-maintenance-kit-mercury-75-115hp-optimax-1-5l-2-stroke-47-9251","title":"Sierra 9251 Outboard Maintenance Kit | Mercury 75–115 HP Optimax 1.5L 2-Stroke (S\/N 1B227000+)","description":"\u003ch2\u003eEverything You Need for a Full Mercury Optimax Service — One Kit.\u003c\/h2\u003e\u003cp\u003eThe Sierra 9251 Outboard Maintenance Kit is a complete, one-box service solution for Mercury 75, 90, and 115 HP Optimax 1.5L 2-stroke outboard engines with serial numbers 1B227000 and up. All components are specifically engineered for this engine family — no guessing on compatibility, no sourcing parts separately.\u003c\/p\u003e\u003cp\u003eSierra maintenance kits are designed to cover all the critical service items at the recommended maintenance interval, so you can complete a full tune-up in a single session with everything pre-selected and ready to install.\u003c\/p\u003e\u003ch3\u003eKit Contents (47-9251)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eImpeller\u003c\/li\u003e\n\u003cli\u003eWater pump repair kit\u003c\/li\u003e\n\u003cli\u003eThermostat\u003c\/li\u003e\n\u003cli\u003eThermostat gasket and bolt\u003c\/li\u003e\n\u003cli\u003eFuel filter\u003c\/li\u003e\n\u003cli\u003eInline oil filter\u003c\/li\u003e\n\u003cli\u003eAnode (aluminum)\u003c\/li\u003e\n\u003cli\u003eAnode mounting bolt\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eAll components engineered specifically for Mercury 75–115 HP Optimax 1.5L 2-stroke outboards\u003c\/li\u003e\n\u003cli\u003eAluminum anodes for corrosion protection in saltwater and freshwater environments\u003c\/li\u003e\n\u003cli\u003eWater pump impeller and repair kit included — the most critical service item for outboard longevity\u003c\/li\u003e\n\u003cli\u003eFuel and oil filters included for a complete fluid system service\u003c\/li\u003e\n\u003cli\u003eThermostat and gasket included to ensure proper engine temperature regulation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury 75 HP Optimax 1.5L 2-stroke outboard — serial numbers 1B227000 and up\u003c\/li\u003e\n\u003cli\u003eMercury 90 HP Optimax 1.5L 2-stroke outboard — serial numbers 1B227000 and up\u003c\/li\u003e\n\u003cli\u003eMercury 115 HP Optimax 1.5L 2-stroke outboard — serial numbers 1B227000 and up\u003c\/li\u003e\n\u003cli\u003eConfirm your engine serial number before ordering to ensure correct kit selection\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eParts Desk Insights\u003c\/h3\u003e\u003cp\u003eThe 9251 kit is the right buy when you're doing a scheduled service on a Mercury Optimax 1.5L and want to handle the water pump, thermostat, anodes, and filters in a single order. The impeller is the most time-sensitive item in this kit — Mercury recommends replacing it every 300 hours or 3 years, whichever comes first, and a failed impeller can cause catastrophic overheating in minutes. If you're already pulling the lower unit for any reason, replacing the impeller at the same time is always worth it.\u003c\/p\u003e\u003cp\u003eFor the larger Mercury V6 Optimax 2.5L kit, see the \u003ca href=\"\/products\/sierra-9252-outboard-maintenance-kit-mercury-mercury-v6-optimax-2-5l-2-stroke-o-b-s-fits-with-s-n-s-1b227000-and-up-non-pro-models-47-9252\"\u003eSierra 9252 Kit\u003c\/a\u003e. For the Mercury V6 Optimax 3.0L kit, see the \u003ca href=\"\/products\/sierra-9253-outboard-maintenance-kit-mercury-mercury-v6-optimax-3-0l-2-stroke-o-b-s-fits-with-s-n-s-1b227000-and-up-non-pro-models-47-9253\"\u003eSierra 9253 Kit\u003c\/a\u003e. For Mercury 4-stroke outboard maintenance kits, see the \u003ca href=\"\/products\/sierra-9243-outboard-maintenance-kit-mercury-75-90-and-115-hp-3-cylinder-4-stroke-o-b-s-fits-with-s-n-s-1b366823-to-2b094995-47-9243\"\u003eSierra 9243 Kit\u003c\/a\u003e or \u003ca href=\"\/products\/sierra-9244-outboard-maintenance-kit-mercury-75-90-and-115-hp-3-cylinder-4-stroke-o-b-s-fits-with-s-n-s-2b094996-and-up-47-9244\"\u003eSierra 9244 Kit\u003c\/a\u003e.\u003c\/p\u003e","brand":"LNS","offers":[{"title":"Default Title","offer_id":51250816155684,"sku":"47-9251","price":655.19,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/47-9251-1.jpg?v=1786510620","url":"https:\/\/marisolmarine.com\/products\/sierra-9251-outboard-maintenance-kit-mercury-75-115hp-optimax-1-5l-2-stroke-47-9251","provider":"Marisol Marine Company","version":"1.0","type":"link"}