{"product_id":"yamaha-lower-unit-assembly-64f-45300-20-4d","title":"Yamaha Lower Unit Assembly - 64F-45300-20-4D","description":"\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-(--header-height)\" dir=\"auto\" data-turn-id=\"78fca5cc-43f9-4c6b-b0fb-48a17f798d84\" data-testid=\"conversation-turn-47\" data-scroll-anchor=\"false\" data-turn=\"user\"\u003e\u003c\/section\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\" data-turn-id=\"request-WEB:e012fad7-3550-49cf-9e4a-53a34e201181-41\" data-testid=\"conversation-turn-48\" data-scroll-anchor=\"true\" data-turn=\"assistant\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-message-author-role=\"assistant\" data-message-id=\"7a33f3b6-5866-44d8-820c-4607976ff5b9\" dir=\"auto\" data-message-model-slug=\"gpt-5-3\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-turn-start-message=\"true\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003ch2 data-section-id=\"1r0m3ke\" data-start=\"0\" data-end=\"77\"\u003eYamaha - Lower Unit Assembly - Gearcase \u0026amp; Power Transfer - 64F-45300-20-4D\u003c\/h2\u003e\n\u003chr data-start=\"79\" data-end=\"82\"\u003e\n\u003ch2 data-section-id=\"rzkdgm\" data-start=\"84\" data-end=\"95\"\u003eOverview\u003c\/h2\u003e\n\u003cp data-start=\"96\" data-end=\"475\"\u003eLower units are one of those components you can’t ignore when they start acting up. I’ve seen motors lose that smooth feel or start making noise, and it almost always points down here. Swapping in a complete Yamaha assembly like this gets everything back to running tight and dependable. It’s the kind of fix that gives you confidence every time you shift into gear and head out.\u003c\/p\u003e\n\u003chr data-start=\"477\" data-end=\"480\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"482\" data-end=\"497\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"498\" data-end=\"882\"\u003e\n\u003cli data-section-id=\"19yrus5\" data-start=\"498\" data-end=\"605\"\u003e\n\u003cstrong data-start=\"500\" data-end=\"530\"\u003eComplete Gearcase Assembly\u003c\/strong\u003e – Includes internal gears and housing for a full lower unit replacement.\u003c\/li\u003e\n\u003cli data-section-id=\"13q8tex\" data-start=\"606\" data-end=\"689\"\u003e\n\u003cstrong data-start=\"608\" data-end=\"633\"\u003eSmooth Power Transfer\u003c\/strong\u003e – Delivers consistent engine output to the propeller.\u003c\/li\u003e\n\u003cli data-section-id=\"wvflmr\" data-start=\"690\" data-end=\"789\"\u003e\n\u003cstrong data-start=\"692\" data-end=\"728\"\u003eCorrosion-Resistant Construction\u003c\/strong\u003e – Built to handle saltwater exposure and harsh marine use.\u003c\/li\u003e\n\u003cli data-section-id=\"12sgrnp\" data-start=\"790\" data-end=\"882\"\u003e\n\u003cstrong data-start=\"792\" data-end=\"820\"\u003eReliable Gear Engagement\u003c\/strong\u003e – Provides clean shifting with reduced noise and vibration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"884\" data-end=\"887\"\u003e\n\u003ch2 data-section-id=\"1qx5o2j\" data-start=\"889\" data-end=\"919\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"920\" data-end=\"1103\"\u003eFits Yamaha outboard engines that utilize this style of lower unit assembly. Commonly used on mid-range horsepower outboards across fishing boats, bay boats, and recreational vessels.\u003c\/p\u003e\n\u003chr data-start=\"1105\" data-end=\"1108\"\u003e\n\u003ch2 data-section-id=\"1hryhf7\" data-start=\"1110\" data-end=\"1116\"\u003eFAQ\u003c\/h2\u003e\n\u003cp data-start=\"1118\" data-end=\"1284\"\u003e\u003cstrong data-start=\"1118\" data-end=\"1176\"\u003eQ: What are the signs my lower unit needs replacement?\u003c\/strong\u003e\u003cbr data-start=\"1176\" data-end=\"1179\"\u003e\u003cstrong data-start=\"1179\" data-end=\"1185\"\u003eA:\u003c\/strong\u003e Grinding noise, slipping gears, water in the gear oil, or hard shifting are all common indicators.\u003c\/p\u003e\n\u003cp data-start=\"1286\" data-end=\"1431\"\u003e\u003cstrong data-start=\"1286\" data-end=\"1342\"\u003eQ: Can I continue running with a damaged lower unit?\u003c\/strong\u003e\u003cbr data-start=\"1342\" data-end=\"1345\"\u003e\u003cstrong data-start=\"1345\" data-end=\"1351\"\u003eA:\u003c\/strong\u003e It’s not recommended—damage can get worse quickly and lead to complete failure.\u003c\/p\u003e\n\u003cp data-start=\"1433\" data-end=\"1562\"\u003e\u003cstrong data-start=\"1433\" data-end=\"1489\"\u003eQ: Do I need to add gear oil before using this unit?\u003c\/strong\u003e\u003cbr data-start=\"1489\" data-end=\"1492\"\u003e\u003cstrong data-start=\"1492\" data-end=\"1498\"\u003eA:\u003c\/strong\u003e Yes, always check and fill to the correct level before running.\u003c\/p\u003e\n\u003cp data-start=\"1564\" data-end=\"1727\"\u003e\u003cstrong data-start=\"1564\" data-end=\"1619\"\u003eQ: How does saltwater affect lower units over time?\u003c\/strong\u003e\u003cbr data-start=\"1619\" data-end=\"1622\"\u003e\u003cstrong data-start=\"1622\" data-end=\"1628\"\u003eA:\u003c\/strong\u003e Salt can cause corrosion and wear, especially around seals, so regular flushing helps extend life.\u003c\/p\u003e\n\u003cp data-start=\"1729\" data-end=\"1890\"\u003e\u003cstrong data-start=\"1729\" data-end=\"1786\"\u003eQ: Is this part still current or has it been updated?\u003c\/strong\u003e\u003cbr data-start=\"1786\" data-end=\"1789\"\u003e\u003cstrong data-start=\"1789\" data-end=\"1795\"\u003eA:\u003c\/strong\u003e This assembly has been superseded by part number 64F-45300-20-8D, which is the latest version.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":46938695041315,"sku":"64F-45300-20-4D","price":4780.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV227673.jpg?v=1698806301","url":"https:\/\/partsvu.com\/en-ca\/products\/yamaha-lower-unit-assembly-64f-45300-20-4d","provider":"PartsVu","version":"1.0","type":"link"}