{"product_id":"688-45341-straight-screw-plug-kit-for-yamaha-jlm-marine","title":"688-45341 Straight Screw Plug Kit for Yamaha | JLM Marine","description":"\u003cbody\u003e\n\n\n\u003cmeta charset=\"UTF-8\"\u003e\n\n\n\n\u003ch2\u003e688-45341 Straight Screw Plug Kit for Yamaha Outboard Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis \u003cstrong\u003eStraight Screw Plug Kit\u003c\/strong\u003e is designed to fit \u003cstrong\u003emost Yamaha outboard engines from 40 to 300 HP\u003c\/strong\u003e. Engineered as a direct replacement for essential lower unit maintenance, this kit ensures reliable sealing for your outboard's gear oil system.\u003c\/p\u003e\n\n\u003cp\u003eThis kit directly replaces Yamaha OEM part numbers \u003cstrong\u003e688-45341-10-00\u003c\/strong\u003e, \u003cstrong\u003e90340-08002-00\u003c\/strong\u003e, and \u003cstrong\u003e90430-08020\u003c\/strong\u003e, providing a comprehensive solution for lower unit drain plug replacement and maintenance.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete kit includes lower unit drain plug, straight screw plug, and gaskets\u003c\/li\u003e\n\u003cli\u003eEssential for routine lower unit oil changes and maintenance\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAlways verify fitment by OEM part number—not solely by engine horsepower\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket sources:\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e688-45341\u003c\/td\u003e\n\u003ctd\u003eLower Unit Drain Plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e688-45341-10-00\u003c\/td\u003e\n\u003ctd\u003eLower Unit Drain Plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90340-08002\u003c\/td\u003e\n\u003ctd\u003eStraight Screw Plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90340-08002-00\u003c\/td\u003e\n\u003ctd\u003eStraight Screw Plug\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90430-08020\u003c\/td\u003e\n\u003ctd\u003eLower Unit Oil Drain Gasket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90430-08003\u003c\/td\u003e\n\u003ctd\u003eLower Unit Oil Drain Gasket\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-serial-number-guide-2025\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/yamaha-outboard-parts-diagrams-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eYamaha Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003eRated HP\u003c\/th\u003e\n\u003cth\u003eNotes\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e40–300 HP\u003c\/td\u003e\n\u003ctd\u003eFits MOST but not all engines in this range—always buy by part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\" style=\"border-collapse:collapse; width:100%;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color:#f2f2f2;\"\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eStraight Screw Plug Kit (Lower Unit Drain \u0026amp; Screw Plug Set)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Numbers\u003c\/td\u003e\n\u003ctd\u003e688-45341, 90430-08020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eMost Yamaha 40–300 HP outboard engines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eLower unit oil drain and fill maintenance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis kit includes all components required for lower unit drain plug replacement:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x Lower Unit Drain Plug\u003c\/strong\u003e (688-45341)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1 x Straight Screw Plug\u003c\/strong\u003e (90340-08002)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2 x Lower Unit Oil Drain Gasket\u003c\/strong\u003e (90430-08020)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e The package contains all the parts shown in the product images.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003ePosition the outboard in an upright position and allow the engine to cool completely before beginning work.\u003c\/li\u003e\n\u003cli\u003ePlace a suitable container beneath the lower unit to catch old gear oil.\u003c\/li\u003e\n\u003cli\u003eRemove the old drain plug and screw plug carefully, allowing all oil to drain completely.\u003c\/li\u003e\n\u003cli\u003eInspect the old gaskets and plugs for wear, corrosion, or damage.\u003c\/li\u003e\n\u003cli\u003eClean the drain and fill plug holes thoroughly, removing any debris or old gasket material.\u003c\/li\u003e\n\u003cli\u003eInstall new gaskets (90430-08020) onto the new drain plug and screw plug.\u003c\/li\u003e\n\u003cli\u003eHand-tighten the new lower unit drain plug (688-45341) into the bottom drain hole.\u003c\/li\u003e\n\u003cli\u003eFill the lower unit with the manufacturer-recommended gear oil through the fill hole until oil appears at the vent hole.\u003c\/li\u003e\n\u003cli\u003eInstall the straight screw plug (90340-08002) with a new gasket into the vent\/fill hole and tighten securely.\u003c\/li\u003e\n\u003cli\u003eTorque both plugs to Yamaha's specifications (consult your service manual for exact values).\u003c\/li\u003e\n\u003cli\u003eWipe away any excess oil and inspect for leaks.\u003c\/li\u003e\n\u003cli\u003eRun the engine briefly and recheck for leaks before returning to normal operation.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my Yamaha outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Always purchase by OEM part number, not by horsepower alone. Cross-reference your existing drain plugs with the part numbers listed (688-45341, 90340-08002, 90430-08020). While this kit fits most 40–300 HP Yamaha engines, some models may use different plug configurations.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the drain plugs and gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace gaskets every time you perform a lower unit oil change (typically every 100 hours or annually). Drain plugs should be inspected for thread wear or corrosion and replaced if damaged or if they no longer seal properly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my drain plugs need replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Look for visible oil weeping around the plugs, stripped or damaged threads, corrosion, or difficulty achieving a tight seal. If you notice milky or contaminated gear oil, inspect seals immediately and replace plugs and gaskets as needed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: No. Always use new gaskets (included in this kit) each time you remove the drain or fill plugs. Reusing old gaskets can result in leaks and potential lower unit damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket plug kits?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\n\u003c\/body\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51983452995897,"sku":"25GK072","price":16.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_2659e97a-2b99-4401-bce5-3bf118e18771.jpg?v=1772505113","url":"https:\/\/jlmmarine.com\/es\/products\/688-45341-straight-screw-plug-kit-for-yamaha-jlm-marine","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}