{"product_id":"688-45341-straight-screw-plug-kit-for-yamaha-jlm-marine-1","title":"688-45341 Straight Screw Plug Kit for Yamaha | JLM Marine","description":"\u003ch2\u003e688-45341 Straight Screw Plug Kit for Yamaha Outboard Engines\u003c\/h2\u003e\n\n\u003cp\u003eThis Straight Screw Plug Kit is designed to fit most Yamaha outboard engines from 40 HP to 300 HP. It provides essential lower unit drain and screw plug components for routine maintenance and oil changes on your Yamaha outboard motor.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect Replacements:\u003c\/strong\u003e This kit replaces Yamaha OEM part numbers 688-45341-10-00, 688-45341, 90340-08002-00, 90340-08002, 90430-08020, and 90430-08003.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete kit\u003c\/strong\u003e includes lower unit drain plug, straight screw plug, and two oil drain gaskets\u003c\/li\u003e\n\u003cli\u003eDesigned for lower unit oil maintenance on Yamaha outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImportant:\u003c\/strong\u003e Always purchase by part number, not by engine horsepower alone\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 brands.\u003c\/p\u003e\n\n\u003cdiv style=\"overflow-x:auto;\"\u003e\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003cth\u003ePart Number\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\u003e688-45341-10-00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e688-45341\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\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90340-08002\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90430-08020\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eYamaha\u003c\/td\u003e\n\u003ctd\u003e90430-08003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\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\u003cp\u003e\u003cstrong\u003eFits:\u003c\/strong\u003e Most (but not all) Yamaha outboard engines rated 40 HP to 300 HP. \u003cstrong\u003eAlways verify by part number before purchasing.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\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\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eLower Unit Drain \u0026amp; Oil Maintenance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCompatibility\u003c\/td\u003e\n\u003ctd\u003eYamaha Outboard 40-300 HP (most models)\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 shown in the product images:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 x Lower Unit Drain Plug (688-45341)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e1 x Straight Screw Plug (90340-08002)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003e2 x Lower Unit Oil Drain Gasket (90430-08020)\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003ePosition your outboard in an upright, vertical position and allow the engine to cool completely before beginning any lower unit maintenance.\u003c\/li\u003e\n\u003cli\u003ePlace a suitable drain pan beneath the lower unit to catch the old gear oil.\u003c\/li\u003e\n\u003cli\u003eUsing the appropriate socket or wrench, carefully remove the old drain plug from the lower unit drain hole.\u003c\/li\u003e\n\u003cli\u003eRemove the upper vent\/fill screw plug to allow proper drainage and airflow.\u003c\/li\u003e\n\u003cli\u003eAllow all old lower unit oil to drain completely; inspect the oil for metal shavings, water contamination, or unusual discoloration.\u003c\/li\u003e\n\u003cli\u003eClean the magnetic drain plug to remove any metal debris, then wipe the drain hole area clean.\u003c\/li\u003e\n\u003cli\u003eInstall a new gasket (90430-08020) onto the lower drain plug (688-45341).\u003c\/li\u003e\n\u003cli\u003eThread the lower drain plug by hand first to avoid cross-threading, then tighten to the manufacturer's specified torque.\u003c\/li\u003e\n\u003cli\u003eRefill the lower unit with the appropriate marine gear oil through the lower drain hole until oil appears at the upper vent hole.\u003c\/li\u003e\n\u003cli\u003eInstall a new gasket onto the upper straight screw plug (90340-08002) and install it hand-tight, then torque to specification.\u003c\/li\u003e\n\u003cli\u003eWipe away any excess oil and inspect both plugs for proper seating and signs of leakage.\u003c\/li\u003e\n\u003cli\u003eRun the engine briefly and recheck both plugs; retighten if necessary and monitor for leaks during your next outing.\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 specific Yamaha outboard?\u003c\/strong\u003e\u003cbr\u003e\nA: Always verify fitment by matching the OEM part numbers (688-45341, 90340-08002, 90430-08020) with your engine's service manual or parts diagram. Do not rely solely on horsepower rating, as some models may use different plug configurations.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should I replace the lower unit drain plugs and gaskets?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the gaskets every time you perform a lower unit oil change (typically every 100 hours or annually). Inspect the drain plugs for wear, corrosion, or stripped threads and replace as needed.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What should I do if I notice metal shavings on the magnetic drain plug?\u003c\/strong\u003e\u003cbr\u003e\nA: Small amounts of fine metal dust are normal and indicate regular gear wear. However, large chunks, excessive debris, or a sudden increase in metal particles may indicate gear damage and should be inspected by a qualified marine technician immediately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old gaskets when reinstalling the drain plugs?\u003c\/strong\u003e\u003cbr\u003e\nA: No, always use new gaskets with each oil change. Reusing old gaskets can result in improper sealing, leading to gear oil leaks and potential lower unit damage.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What's the difference between OEM and aftermarket plugs and gaskets?\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","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":51983453061433,"sku":"25GK074","price":16.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/12_912acdb3-c801-4264-80b4-3a702b8c95e3.jpg?v=1772505119","url":"https:\/\/jlmmarine.com\/products\/688-45341-straight-screw-plug-kit-for-yamaha-jlm-marine-1","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}