{"product_id":"new-aftermarket-yamaha-200-225hp-v6-2-4-stroke-outboard-lower-unit-90-421","title":"New Aftermarket Yamaha 200-225HP V6 2-4-Stroke Outboard Lower Unit 90-421","description":"\u003cp data-start=\"789\" data-end=\"936\"\u003e\u003cstrong data-start=\"789\" data-end=\"936\"\u003eNew Yamaha 200–250HP V6 76° (1990–2019) Replacement Lower Unit – Aftermarket – Standard Rotation – Fits 20″, 25″ \u0026amp; 30″ Shafts – 3-Year Warranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"938\" data-end=\"1238\"\u003eUpgrade or replace your Yamaha outboard’s lower unit with this \u003cstrong data-start=\"1001\" data-end=\"1042\"\u003eSEI 90-421 Standard Rotation Gearcase\u003c\/strong\u003e, engineered for \u003cstrong data-start=\"1059\" data-end=\"1086\"\u003eYamaha V6 76° 200–250HP\u003c\/strong\u003e models. Designed for \u003cstrong data-start=\"1108\" data-end=\"1132\"\u003e2-stroke (3.1L\/3.2L)\u003c\/strong\u003e and \u003cstrong data-start=\"1137\" data-end=\"1161\"\u003e4-stroke (200–250HP)\u003c\/strong\u003e engines, this unit offers OEM-level performance at a fraction of the cost.\u003c\/p\u003e\n\u003cp data-start=\"1240\" data-end=\"1452\"\u003eIt’s available in \u003cstrong data-start=\"1258\" data-end=\"1293\"\u003e20″, 25″, and 30″ shaft lengths\u003c\/strong\u003e and comes pre-painted black with a \u003cstrong data-start=\"1329\" data-end=\"1350\"\u003epaintable surface\u003c\/strong\u003e for easy color matching. The \u003cstrong data-start=\"1380\" data-end=\"1401\"\u003edirect-fit design\u003c\/strong\u003e ensures easy installation—no modifications needed.\u003c\/p\u003e\n\u003chr data-start=\"1454\" data-end=\"1457\"\u003e\n\u003ch3 data-start=\"1459\" data-end=\"1488\"\u003e\u003cstrong data-start=\"1466\" data-end=\"1488\"\u003eKey Specifications of Yamaha 200–250HP V6 Lower Unit\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cdiv class=\"_tableContainer_1rjym_1\"\u003e\n\u003cdiv class=\"group _tableWrapper_1rjym_13 flex w-fit flex-col-reverse\" tabindex=\"-1\"\u003e\n\u003ctable class=\"w-fit min-w-(--thread-content-width)\" data-start=\"1490\" data-end=\"2163\"\u003e\n\u003cthead data-start=\"1490\" data-end=\"1511\"\u003e\n\u003ctr data-start=\"1490\" data-end=\"1511\"\u003e\n\u003cth data-start=\"1490\" data-end=\"1500\" data-col-size=\"sm\"\u003eFeature\u003c\/th\u003e\n\u003cth data-start=\"1500\" data-end=\"1511\" data-col-size=\"lg\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"1536\" data-end=\"2163\"\u003e\n\u003ctr data-start=\"1536\" data-end=\"1573\"\u003e\n\u003ctd data-start=\"1536\" data-end=\"1559\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1538\" data-end=\"1558\"\u003eHorsepower Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1559\" data-end=\"1573\"\u003e200–250 HP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1574\" data-end=\"1650\"\u003e\n\u003ctd data-start=\"1574\" data-end=\"1593\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1576\" data-end=\"1592\"\u003eEngine Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1593\" data-end=\"1650\"\u003e2-Stroke V6 (3.1 L \/ 3.2 L), 4-Stroke V6 (200–225 HP)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1651\" data-end=\"1691\"\u003e\n\u003ctd data-start=\"1651\" data-end=\"1666\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1653\" data-end=\"1665\"\u003eRotation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1666\" data-end=\"1691\"\u003eStandard (Right-Hand)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1692\" data-end=\"1729\"\u003e\n\u003ctd data-start=\"1692\" data-end=\"1712\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1694\" data-end=\"1711\"\u003eShaft Lengths\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1712\" data-end=\"1729\"\u003e20″, 25″, 30″\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1730\" data-end=\"1788\"\u003e\n\u003ctd data-start=\"1730\" data-end=\"1748\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1732\" data-end=\"1747\"\u003eGear Ratios\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1748\" data-end=\"1788\"\u003e1.81:1 (2-Stroke) \/ 2.0:1 (4-Stroke)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1789\" data-end=\"1823\"\u003e\n\u003ctd data-start=\"1789\" data-end=\"1802\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1791\" data-end=\"1801\"\u003eFinish\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1802\" data-end=\"1823\"\u003eBlack (Paintable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1824\" data-end=\"1857\"\u003e\n\u003ctd data-start=\"1824\" data-end=\"1844\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1826\" data-end=\"1843\"\u003eYears Covered\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1844\" data-end=\"1857\"\u003e1990–2019\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1858\" data-end=\"1923\"\u003e\n\u003ctd data-start=\"1858\" data-end=\"1884\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1860\" data-end=\"1883\"\u003eCompatibility Notes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1884\" data-end=\"1923\"\u003eNot for 4-Stroke F250 250 HP models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1924\" data-end=\"1985\"\u003e\n\u003ctd data-start=\"1924\" data-end=\"1943\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1926\" data-end=\"1942\"\u003eInstallation\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"1943\" data-end=\"1985\"\u003eDirect-Fit – No Modifications Required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"1986\" data-end=\"2022\"\u003e\n\u003ctd data-start=\"1986\" data-end=\"2001\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"1988\" data-end=\"2000\"\u003eWarranty\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"2001\" data-end=\"2022\"\u003e3-Year Fault-Free\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2023\" data-end=\"2163\"\u003e\n\u003ctd data-start=\"2023\" data-end=\"2043\" data-col-size=\"sm\"\u003e\u003cstrong data-start=\"2025\" data-end=\"2042\"\u003ePart Variants\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd data-col-size=\"lg\" data-start=\"2043\" data-end=\"2163\"\u003eA20 (1.81:1 \/ 20″), A25 (1.81:1 \/ 25″), A30 (1.81:1 \/ 30″), B25F (2.0:1 \/ 25″ 4-Stroke), B30F (2.0:1 \/ 30″ 4-Stroke)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"2165\" data-end=\"2168\"\u003e\n\u003ch3 data-start=\"2170\" data-end=\"2190\"\u003e\n\u003cstrong data-start=\"2176\" data-end=\"2190\"\u003eWhy choose \u003c\/strong\u003e\u003cstrong data-start=\"1466\" data-end=\"1488\"\u003eYamaha 200–250HP V6 Lower Unit\u003c\/strong\u003e\n\u003c\/h3\u003e\n\u003cul data-start=\"2191\" data-end=\"2429\"\u003e\n\u003cli data-start=\"2191\" data-end=\"2253\"\u003e\n\u003cp data-start=\"2193\" data-end=\"2253\"\u003eDirect-fit replacement for \u003ca href=\"https:\/\/yamahaoutboards.com\/\"\u003eYamaha\u003c\/a\u003e V6 76° 200–250HP engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2254\" data-end=\"2310\"\u003e\n\u003cp data-start=\"2256\" data-end=\"2310\"\u003eWorks with both 2-stroke and 4-stroke configurations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2311\" data-end=\"2360\"\u003e\n\u003cp data-start=\"2313\" data-end=\"2360\"\u003eAvailable in multiple shaft lengths (20″–30″)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2361\" data-end=\"2395\"\u003e\n\u003cp data-start=\"2363\" data-end=\"2395\"\u003eDurable paintable black finish\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2396\" data-end=\"2429\"\u003e\n\u003cp data-start=\"2398\" data-end=\"2429\"\u003eBacked by a \u003cstrong data-start=\"2410\" data-end=\"2429\"\u003e3-Year Warranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003csection id=\"faq\"\u003e\n\u003ch2\u003eFrequently Asked Questions – Yamaha 200–250HP V6 Replacement Lower Unit\u003c\/h2\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003e1. Which Yamaha outboard models are compatible with the SEI 90-416 replacement lower unit?\u003c\/h3\u003e\n\u003cp\u003eThe SEI 90-416 lower unit is compatible with Yamaha 200–250HP 76° V6 outboards manufactured from 1990 to 2019. It supports both 2-stroke (3.1L\/3.2L) and 4-stroke (200–225HP) engines, except for the 4-stroke F250 250 HP models. Available shaft lengths include 20″, 25″, and 30″ for versatile fitment across model variations.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003e2. What gear ratios does this lower unit offer, and how should I choose the correct one?\u003c\/h3\u003e\n\u003cp\u003eThis lower unit is offered with gear ratios of 1.81:1 for 2-stroke engines and 2.0:1 for 4-stroke engines. Refer to your outboard’s original gear ratio indicated in the owner’s manual or on the engine’s model plate to select the appropriate ratio for optimum performance and propulsion efficiency.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003e3. Is the SEI 90-416 lower unit new or rebuilt, and how is its quality assured?\u003c\/h3\u003e\n\u003cp\u003eThe SEI 90-416 replacement lower unit is a brand-new aftermarket assembly built to OEM specifications. It arrives fully assembled, painted black with a paintable surface, and backed by a 3-year fault-free warranty. This ensures OEM-level durability and performance at a more affordable price than factory units.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003e4. Does installation require any modifications or special preparation?\u003c\/h3\u003e\n\u003cp\u003eInstallation is a direct bolt-on fit requiring no modifications. The unit ships painted black and ready to install, suitable for both freshwater and saltwater environments. Confirm your shaft length (20″, 25″, or 30″) and gear ratio before installation to ensure proper fit and function.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003e5. What warranty coverage does the SEI 90-416 lower unit include?\u003c\/h3\u003e\n\u003cp\u003eSEI offers a comprehensive 3-year fault-free warranty covering manufacturing defects and failures under normal recreational use. This warranty provides peace of mind by ensuring long-term reliability and support for your Yamaha 200–250HP V6 lower unit replacement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003chr data-start=\"1454\" data-end=\"1457\"\u003e\n\u003cp\u003eLooking for other models or gear ratios?\u003cbr data-start=\"484\" data-end=\"487\"\u003e\u003cstrong data-start=\"490\" data-end=\"587\"\u003e\u003ca class=\"decorated-link\" href=\"https:\/\/allboatsupplies.com\/outboard-lower-unit\/yamaha\/\" rel=\"noopener\" data-start=\"492\" data-end=\"585\"\u003eBrowse all Yamaha Lower Units here\u003c\/a\u003e\u003c\/strong\u003e — find compatible options for 40HP, 60HP, 115HP, 150HP, and more Yamaha outboards.\u003c\/p\u003e\n\u003cdiv class=\"_tableContainer_80l1q_1\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"All Marine Suppliers","offers":[{"title":"3.1-3.2L \/ 2 Stroke \/ 20\"","offer_id":47822942306563,"sku":"SE90-421-A20","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"3.1-3.2L \/ 2 Stroke \/ 25\"","offer_id":47822942339331,"sku":"SE90-421-A25","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"3.1-3.2L \/ 2 Stroke \/ 30\"","offer_id":47822942372099,"sku":"SE90-421-A30","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"4 Stroke \/ 25\"","offer_id":47822942404867,"sku":"SE90-421-B25F","price":1195.0,"currency_code":"USD","in_stock":true},{"title":"4 Stroke \/ 30\"","offer_id":47822942437635,"sku":"SE90-421-B30F","price":1195.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/2613\/8883\/files\/b7ff2c70-1-1.png?v=1772820585","url":"https:\/\/allmarinesuppliers.com\/products\/new-aftermarket-yamaha-200-225hp-v6-2-4-stroke-outboard-lower-unit-90-421","provider":"All Marine Suppliers","version":"1.0","type":"link"}