{"product_id":"yamaha-lower-unit-assembly-64f-45300-03-8d","title":"Yamaha Lower Unit Assembly - 64F-45300-03-8D","description":"\u003ch2 data-section-id=\"1qz6kyr\" data-start=\"0\" data-end=\"77\"\u003eYamaha - Lower Unit Assembly - Gearcase \u0026amp; Power Transfer - 64F-45300-03-8D\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=\"539\"\u003eOn these Yamaha setups, when the lower unit is right, the whole motor just feels smooth and predictable. I’ve seen plenty come in with worn units that start getting noisy or shifting rough, and swapping in a fresh assembly fixes it all in one shot. This is the kind of replacement that brings back clean engagement and steady power to the prop. Once it’s installed, you can run it hard again without second guessing what’s going on down below.\u003c\/p\u003e\n\u003chr data-start=\"541\" data-end=\"544\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"546\" data-end=\"561\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"562\" data-end=\"953\"\u003e\n\u003cli data-section-id=\"19yrus5\" data-start=\"562\" data-end=\"669\"\u003e\n\u003cstrong data-start=\"564\" data-end=\"594\"\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=\"670\" data-end=\"753\"\u003e\n\u003cstrong data-start=\"672\" data-end=\"697\"\u003eSmooth Power Transfer\u003c\/strong\u003e – Delivers consistent engine output to the propeller.\u003c\/li\u003e\n\u003cli data-section-id=\"1hrgkjk\" data-start=\"754\" data-end=\"860\"\u003e\n\u003cstrong data-start=\"756\" data-end=\"792\"\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=\"861\" data-end=\"953\"\u003e\n\u003cstrong data-start=\"863\" data-end=\"891\"\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=\"955\" data-end=\"958\"\u003e\n\u003ch2 data-section-id=\"1qx5o2j\" data-start=\"960\" data-end=\"990\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"991\" data-end=\"1184\"\u003eFits Yamaha outboard engines that utilize this style of lower unit assembly. Commonly used on mid- to high-horsepower outboards across offshore boats, center consoles, and recreational vessels.\u003c\/p\u003e\n\u003chr data-start=\"1186\" data-end=\"1189\"\u003e\n\u003ch2 data-section-id=\"1hryhf7\" data-start=\"1191\" data-end=\"1197\"\u003eFAQ\u003c\/h2\u003e\n\u003cp data-start=\"1199\" data-end=\"1353\"\u003e\u003cstrong data-start=\"1199\" data-end=\"1248\"\u003eQ: What are signs my lower unit is going bad?\u003c\/strong\u003e\u003cbr data-start=\"1248\" data-end=\"1251\"\u003e\u003cstrong data-start=\"1251\" data-end=\"1257\"\u003eA:\u003c\/strong\u003e Grinding noise, slipping gears, water in gear oil, or rough shifting are all common indicators.\u003c\/p\u003e\n\u003cp data-start=\"1355\" data-end=\"1500\"\u003e\u003cstrong data-start=\"1355\" data-end=\"1415\"\u003eQ: Can I keep running if the lower unit is making noise?\u003c\/strong\u003e\u003cbr data-start=\"1415\" data-end=\"1418\"\u003e\u003cstrong data-start=\"1418\" data-end=\"1424\"\u003eA:\u003c\/strong\u003e It’s not recommended—damage can get worse quickly and lead to full failure.\u003c\/p\u003e\n\u003cp data-start=\"1502\" data-end=\"1637\"\u003e\u003cstrong data-start=\"1502\" data-end=\"1560\"\u003eQ: Do I need to check gear oil before using this unit?\u003c\/strong\u003e\u003cbr data-start=\"1560\" data-end=\"1563\"\u003e\u003cstrong data-start=\"1563\" data-end=\"1569\"\u003eA:\u003c\/strong\u003e Yes, always confirm it’s filled to the proper level before running.\u003c\/p\u003e\n\u003cp data-start=\"1639\" data-end=\"1796\"\u003e\u003cstrong data-start=\"1639\" data-end=\"1690\"\u003eQ: How does saltwater use affect this assembly?\u003c\/strong\u003e\u003cbr data-start=\"1690\" data-end=\"1693\"\u003e\u003cstrong data-start=\"1693\" data-end=\"1699\"\u003eA:\u003c\/strong\u003e Salt can cause corrosion and wear over time, especially around seals, so regular flushing helps.\u003c\/p\u003e\n\u003cp data-start=\"1798\" data-end=\"1964\"\u003e\u003cstrong data-start=\"1798\" data-end=\"1851\"\u003eQ: Is installation something I can handle myself?\u003c\/strong\u003e\u003cbr data-start=\"1851\" data-end=\"1854\"\u003e\u003cstrong data-start=\"1854\" data-end=\"1860\"\u003eA:\u003c\/strong\u003e If you’ve done lower unit swaps before, it’s manageable, but proper alignment and torque are important.\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":46938695172387,"sku":"64F-45300-03-8D","price":1460.72,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV227672.jpg?v=1698806301","url":"https:\/\/partsvu.com\/en-mx\/products\/yamaha-lower-unit-assembly-64f-45300-03-8d","provider":"PartsVu","version":"1.0","type":"link"}