{"product_id":"mercury-lower-unit-se205-3-4-cylinder-70-125hp","title":"Mercury Lower Unit SE205 | 3 \u0026 4 Cylinder Outboard Replacement (70–125HP)","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf your Mercury outboard is losing performance or showing signs of wear, replacing the lower unit is the smartest move. The SE205 lower unit is engineered as a dependable aftermarket replacement for most Mercury 3 and 4 cylinder outboards, delivering smooth power transfer, improved durability, and long-lasting performance on the water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBuilt for reliability, this unit supports multiple configurations including 2-stroke carb, DFI, and 4-stroke engines. Whether you're upgrading an older setup or replacing a worn-out lower unit, the SE205 ensures consistent performance across a wide range of applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDesigned for marine enthusiasts who demand durability and precision, this lower unit is a trusted solution for restoring engine efficiency without the high cost of OEM replacements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e Key Features\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFits most Mercury 3 \u0026amp; 4 cylinder outboards (1987 \u0026amp; newer)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCompatible with 70–125 HP engines\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eSupports 2-stroke (Carb \u0026amp; DFI) and 4-stroke engines\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAvailable in multiple gear ratios (2.07:1, 2.33:1)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMultiple shaft options: 20” and 25”\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHeavy-duty construction for long-lasting use\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIdeal aftermarket replacement for worn lower units\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e Technical Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eFeature\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eDetails\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eModel\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eSE205\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eEngine Type\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2-Stroke (Carb, DFI), 4-Stroke\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eHorsepower Range\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e70–125 HP\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eGear Ratios\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e2.07:1, 2.33:1\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eShaft Length\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e20\", 25\"\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCompatibility\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMercury 3 \u0026amp; 4 Cylinder Engines\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eCondition\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eNew (Aftermarket)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003eCompatibility Notes\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReplaces most Mercury 3 \u0026amp; 4 Cylinder 2-Stroke engines (1987 \u0026amp; newer)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlso compatible with 75–115 HP 4-Stroke engines (below Serial #0T801000)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWill NOT replace 3-jaw lower units unless shift shaft is changed\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNot compatible with models using plastic water pump housing\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRequires correct gear ratio verification before purchase\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e Application Guide (Important)\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.31 gear ratio is discontinued → use 2.33 as replacement\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eVerify engine type: Carb, DFI (Direct Fuel Injection), or 4-stroke\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eShaft length:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eL = 20\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eXL = 25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eSome models may have 22.5\" shaft (not supported)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMust have 4-1\/4\" bullet diameter\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e Variants (Clear Explanation)\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eEach variant includes:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e👉 Gear Ratio + Engine Type + Shaft Length\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eExample:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.07 \/ 2-Stroke Carb \/ 20\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.07 \/ 2-Stroke DFI \/ 25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.07 \/ 4-Stroke \/ 20\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.33 \/ 2-Stroke Carb \/ 20\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.33 \/ 2-Stroke DFI \/ 25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.33 \/ 4-Stroke \/ 25\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e2.33 \/ Bigfoot 40–60HP \/ 20\"\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e Choose based on:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eEngine type\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eShaft length\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRequired gear ratio\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e What’s Included\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eComplete Lower Unit Assembly\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePre-installed internal components\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReady-to-install design\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cspan\u003e Important Notes\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways verify engine serial number before ordering\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProfessional installation recommended\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eContact support for fitment confirmation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIncorrect selection may cause compatibility issues\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003ch3\u003e\u003cbr\u003e\u003c\/h3\u003e","brand":"Mercury","offers":[{"title":"2.07\/2-Stroke Carb\/20","offer_id":47848276263171,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.07\/2-Stroke DFI\/20","offer_id":47848276295939,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.07\/4-Stroke\/20","offer_id":47848276328707,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.07\/2-Stroke Carb\/25","offer_id":47848276361475,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.07\/2-Stroke DFI\/25","offer_id":47848276394243,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.07\/4-Stroke\/25","offer_id":47848276427011,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/2-Stroke Carb\/20","offer_id":47848276459779,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/2-Stroke DFI\/20","offer_id":47848276492547,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/4-Stroke\/20","offer_id":47848276525315,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/2-Stroke 50-60HP Bigfoot\/20","offer_id":47848276558083,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/4-Stroke 40-60HP Bigfoot\/20","offer_id":47848276590851,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/4-Stroke 30-50HP Bigfoot\/20","offer_id":47848276623619,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/2-Stroke Carb\/25","offer_id":47848276656387,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/2-Stroke DFI\/25","offer_id":47848276689155,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/4-Stroke\/25","offer_id":47848276721923,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"2.33\/4-Stroke 40-60HP Bigfoot\/25","offer_id":47848276754691,"sku":"ST-90-205","price":1195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/2613\/8883\/files\/205_2_362x550_0d869803-f267-4fdc-ad93-a9b07c8f8103.jpg?v=1773773758","url":"https:\/\/allmarinesuppliers.com\/products\/mercury-lower-unit-se205-3-4-cylinder-70-125hp","provider":"All Marine Suppliers","version":"1.0","type":"link"}