{"product_id":"hydrofoil-stabilizer-fits-outboard-sterndrive-motors-40-300-hp-replaces-n-a","title":"Hydrofoil Stabilizer – Fits Outboard \u0026 Sterndrive Motors 40-300 HP (Replaces N\/A)","description":"\u003csection\u003e\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis universal Whale Tail Hydrofoil Stabilizer is designed to fit most outboard and sterndrive engines from 40–300 HP. It provides improved on-the-water performance, including quicker planing, better fuel efficiency, and reduced porpoising. Please note, it is not compatible with Mercury 40 HP 4-Stroke motors and other specific models listed in the compatibility section.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Bolt-on installation requires drilling and uses the provided stainless steel hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Constructed from durable, marine-grade UV-resistant Reinforced Nylon PA66 plastic.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e Features a crescent-shaped surface with a streamlined design for improved water flow and maximum lift.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\u003cp\u003eConfirm your engine model and year in the table below. This part is designed for universal fitment but has known exceptions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eUniversal Fitment:\u003c\/strong\u003e The hydrofoil fits most outboard and sterndrive motors in the 40–300 HP range.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExceptions:\u003c\/strong\u003e Note the specific models from Mercury, Volvo, Honda, and Yamaha that are confirmed to be incompatible.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModels\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\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\u003eUniversal\u003c\/td\u003e\n        \u003ctd\u003eMost outboards and sterndrives\u003c\/td\u003e\n        \u003ctd\u003e40–300\u003c\/td\u003e\n        \u003ctd\u003e2- \u0026amp; 4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eNot compatible with Mercury 40 HP 4-Stroke\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e40\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eExplicitly noted as incompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eBravo II\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eIncompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eMercury\u003c\/td\u003e\n        \u003ctd\u003eBravo III with only one anode\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eIncompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eVolvo\u003c\/td\u003e\n        \u003ctd\u003eWith exhaust through cavitation plate\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eIncompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eOutboards\u003c\/td\u003e\n        \u003ctd\u003e200+\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eIncompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eYamaha\u003c\/td\u003e\n        \u003ctd\u003eOutboards\u003c\/td\u003e\n        \u003ctd\u003e350\u003c\/td\u003e\n        \u003ctd\u003e\u003c\/td\u003e\n        \u003ctd\u003eAll\u003c\/td\u003e\n        \u003ctd\u003eN\/A\u003c\/td\u003e\n        \u003ctd\u003eIncompatible\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eMarine Hydrofoil Stabilizer (Whale Tail)\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eBolt-on with provided hardware (drilling required)\u003c\/dd\u003e\n  \u003cdt\u003eMaterial\u003c\/dt\u003e\n\u003cdd\u003eMarine Grade UV-Resistant Reinforced Nylon PA66 Plastic\u003c\/dd\u003e\n  \u003cdt\u003eColor\u003c\/dt\u003e\n\u003cdd\u003eSilver\u003c\/dd\u003e\n  \u003cdt\u003eEngine Type\u003c\/dt\u003e\n\u003cdd\u003e2-Stroke \u0026amp; 4-Stroke\u003c\/dd\u003e\n  \u003cdt\u003eEngine Size\u003c\/dt\u003e\n\u003cdd\u003e40–300 HP\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eH: 13.5\" × W: 14\" (343 × 356 mm)\u003c\/dd\u003e\n  \u003cdt\u003eDesign Feature\u003c\/dt\u003e\n\u003cdd\u003eCrescent shaped surface with streamlined design for improved water flow\u003c\/dd\u003e\n\u003c\/dl\u003e\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Hydrofoil Stabilizer\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e4 x Sets of Screws and Nuts\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:#d0021b;\"\u003e1 x Drill Bit\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e1 x Installation Instructions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfirm Fit:\u003c\/strong\u003e Before drilling, position the hydrofoil on the outboard\/sterndrive's cavitation plate to ensure a proper fit and alignment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMark Holes:\u003c\/strong\u003e With the hydrofoil held firmly in the desired position, use a marker to carefully mark the drilling points through the mounting holes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrill Holes:\u003c\/strong\u003e Remove the hydrofoil. Using the provided drill bit, carefully drill through the cavitation plate at the marked locations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApply Sealant (Recommended):\u003c\/strong\u003e Apply a marine-grade sealant around the drilled holes to prevent water ingress and corrosion.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount Hydrofoil:\u003c\/strong\u003e Position the hydrofoil and insert the bolts. Secure them with the provided nuts, ensuring not to overtighten.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinal Check:\u003c\/strong\u003e Check that the hydrofoil is secure and does not interfere with the propeller's movement or trim\/tilt operation. Test on the water at low speeds first.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do I know if this hydrofoil will fit my specific motor?\u003c\/summary\u003e\n\u003cp\u003eThis hydrofoil offers a universal fit for most outboard and sterndrive motors from 40 to 300 HP. However, we strongly recommend you review the compatibility table, which lists all known exceptions, such as the Mercury 40 HP 4-Stroke and certain Volvo, Honda, and Yamaha models. Do not purchase if your model is listed as incompatible.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs drilling into my engine's cavitation plate required for installation?\u003c\/summary\u003e\n\u003cp\u003eYes, installation is a bolt-on process that requires drilling four holes into the cavitation plate. All necessary mounting hardware (screws, nuts) and a drill bit are included in the package.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat specific performance improvements can I expect?\u003c\/summary\u003e\n\u003cp\u003eProperly installed, the hydrofoil can significantly improve your boat's performance by getting it on plane faster, reducing or eliminating porpoising (bouncing), and improving fuel efficiency at cruising speeds by allowing lower RPMs.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the hydrofoil made from?\u003c\/summary\u003e\n\u003cp\u003eIt is manufactured from a high-strength, Marine Grade UV-Resistant Reinforced Nylon PA66 Plastic, designed to withstand harsh saltwater and freshwater environments without cracking or degrading.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are the signs of incorrect installation or failure?\u003c\/summary\u003e\n\u003cp\u003eIf installed incorrectly, you may notice no change or a negative change in performance, or unusual vibration. Signs of failure include visible cracks or the hydrofoil becoming loose. Regularly check that the mounting hardware is tight.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat if I don't see any improvement after installation?\u003c\/summary\u003e\n\u003cp\u003ePerformance gains can vary based on boat hull, weight distribution, and engine height. Ensure the hydrofoil is mounted correctly and securely. Experimenting with your engine's trim angle can also help optimize its effect.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\n\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\n\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\n\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n\u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50717913743675,"sku":"QM-HS003-Silver","price":65.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/QM-HS003-Silver.png?v=1762938297","url":"https:\/\/seasierra.com\/products\/hydrofoil-stabilizer-fits-outboard-sterndrive-motors-40-300-hp-replaces-n-a","provider":"SeaSierra","version":"1.0","type":"link"}