{"product_id":"yamaha-lower-unit-assembly-64f-45300-00-8d","title":"Yamaha Lower Unit Assembly - 64F-45300-00-8D","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=\"4abfe29c-429c-4a23-880e-795f2916edde\" data-testid=\"conversation-turn-33\" 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-53a34e201181-34\" data-testid=\"conversation-turn-34\" 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=\"cb1bd417-94cd-4f1e-9c16-162142f16fca\" 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=\"1qz79c0\" data-start=\"0\" data-end=\"77\"\u003eYamaha - Lower Unit Assembly - Gearcase \u0026amp; Power Transfer - 64F-45300-00-8D\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=\"517\"\u003eWhen a lower unit starts giving you trouble, it usually shows up fast—noise, rough shifting, or just not feeling right under load. I’ve replaced a lot of these over the years, and a fresh Yamaha assembly like this brings everything back to smooth, dependable operation. You get that solid engagement and quiet run that you expect when things are set up right. It’s the kind of fix that lets you run with confidence again.\u003c\/p\u003e\n\u003chr data-start=\"519\" data-end=\"522\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"524\" data-end=\"539\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"540\" data-end=\"955\"\u003e\n\u003cli data-section-id=\"19yrus5\" data-start=\"540\" data-end=\"647\"\u003e\n\u003cstrong data-start=\"542\" data-end=\"572\"\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=\"50xloy\" data-start=\"648\" data-end=\"755\"\u003e\n\u003cstrong data-start=\"650\" data-end=\"675\"\u003eSmooth Power Transfer\u003c\/strong\u003e – Delivers consistent engine power to the propeller for reliable performance.\u003c\/li\u003e\n\u003cli data-section-id=\"1hrgkjk\" data-start=\"756\" data-end=\"862\"\u003e\n\u003cstrong data-start=\"758\" data-end=\"794\"\u003eCorrosion-Resistant Construction\u003c\/strong\u003e – Built to handle saltwater exposure and harsh marine conditions.\u003c\/li\u003e\n\u003cli data-section-id=\"12sgrnp\" data-start=\"863\" data-end=\"955\"\u003e\n\u003cstrong data-start=\"865\" data-end=\"893\"\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=\"957\" data-end=\"960\"\u003e\n\u003ch2 data-section-id=\"1qx5o2j\" data-start=\"962\" data-end=\"992\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"993\" data-end=\"1179\"\u003eFits Yamaha outboard engines that utilize this style of lower unit assembly. Commonly used on mid-range horsepower applications across fishing boats, bay boats, and recreational vessels.\u003c\/p\u003e\n\u003chr data-start=\"1181\" data-end=\"1184\"\u003e\n\u003ch2 data-section-id=\"1hryhf7\" data-start=\"1186\" data-end=\"1192\"\u003eFAQ\u003c\/h2\u003e\n\u003cp data-start=\"1194\" data-end=\"1369\"\u003e\u003cstrong data-start=\"1194\" data-end=\"1255\"\u003eQ: What are common signs my lower unit needs replacement?\u003c\/strong\u003e\u003cbr data-start=\"1255\" data-end=\"1258\"\u003e\u003cstrong data-start=\"1258\" data-end=\"1264\"\u003eA:\u003c\/strong\u003e Grinding noise, slipping gears, water in the gear oil, or difficulty shifting are all strong indicators.\u003c\/p\u003e\n\u003cp data-start=\"1371\" data-end=\"1525\"\u003e\u003cstrong data-start=\"1371\" data-end=\"1430\"\u003eQ: Can I keep running if my lower unit is making noise?\u003c\/strong\u003e\u003cbr data-start=\"1430\" data-end=\"1433\"\u003e\u003cstrong data-start=\"1433\" data-end=\"1439\"\u003eA:\u003c\/strong\u003e It’s risky—continued use can cause more internal damage and lead to complete failure.\u003c\/p\u003e\n\u003cp data-start=\"1527\" data-end=\"1663\"\u003e\u003cstrong data-start=\"1527\" data-end=\"1585\"\u003eQ: Do I need to check gear oil before using this unit?\u003c\/strong\u003e\u003cbr data-start=\"1585\" data-end=\"1588\"\u003e\u003cstrong data-start=\"1588\" data-end=\"1594\"\u003eA:\u003c\/strong\u003e Yes, always confirm proper gear oil level before running the engine.\u003c\/p\u003e\n\u003cp data-start=\"1665\" data-end=\"1826\"\u003e\u003cstrong data-start=\"1665\" data-end=\"1720\"\u003eQ: How does saltwater affect lower units over time?\u003c\/strong\u003e\u003cbr data-start=\"1720\" data-end=\"1723\"\u003e\u003cstrong data-start=\"1723\" data-end=\"1729\"\u003eA:\u003c\/strong\u003e Salt can cause corrosion, especially around seals and housing, so regular flushing is important.\u003c\/p\u003e\n\u003cp data-start=\"1828\" data-end=\"1989\"\u003e\u003cstrong data-start=\"1828\" data-end=\"1885\"\u003eQ: Is this part still current or has it been updated?\u003c\/strong\u003e\u003cbr data-start=\"1885\" data-end=\"1888\"\u003e\u003cstrong data-start=\"1888\" data-end=\"1894\"\u003eA:\u003c\/strong\u003e This assembly has been superseded by part number 64F-45300-01-8D, 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":46938695368995,"sku":"64F-45300-00-8D","price":4785.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV227669.jpg?v=1698806303","url":"https:\/\/partsvu.com\/en-mx\/products\/yamaha-lower-unit-assembly-64f-45300-00-8d","provider":"PartsVu","version":"1.0","type":"link"}