Whale Tail Hydrofoil Stabilizer – Fits Outboard and Sterndrive Motors 40-300 HP

Whale Tail Hydrofoil Stabilizer – Fits Outboard and Sterndrive Motors 40-300 HP

This universal hydrofoil stabilizer is designed for most outboard and sterndrive engines ranging from 40 to 300 HP. It enhances performance by enabling quicker planing, improving fuel efficiency, and reducing porpoising and cavitation. Its crescent-shaped surface and streamlined design optimize water flow for better control.

Please note: This hydrofoil is not compatible with Mercury 40 HP 4-Stroke motors, Mercury Bravo II or Bravo III (with one anode) sterndrives, Volvo Penta engines with exhaust through the cavitation plate, Honda 200+ HP outboards, or Yamaha 350 HP outboards.

• Installation Method: Bolt-on installation requires drilling into the cavitation plate (hardware and drill bit included).
• Material Construction: Made from durable, marine-grade UV-resistant Reinforced Nylon PA66 plastic for longevity.
• Engine Compatibility: Fits a wide range of 2-stroke and 4-stroke outboard and sterndrive engines.

Compatible Engine Models

Confirm your engine model/year in the table below.

Exceptions and Incompatibility

Technical Specifications

Package Contents

• 1 x Hydrofoil Stabilizer
• 4 x Sets of Screws and Nuts
• 1 x Drill Bit
• 1 x Installation Instructions

Installation Guide

1. Center the hydrofoil on the top of the sterndrive or outboard motor's cavitation plate.
2. Ensure the hydrofoil is positioned correctly, leaving clearance for the propeller.
3. Mark the four mounting hole locations on the cavitation plate.
4. Use the included drill bit to drill the marked holes through the plate.
5. Place the hydrofoil back onto the plate, aligning the holes.
6. Insert the stainless steel bolts from the top and secure them with the lock nuts from the bottom.
7. Tighten all four sets of hardware securely. Do not overtighten to avoid damaging the plate.
8. Verify the installation is rigid and does not move.

Troubleshooting & FAQ

Q: How do I confirm this hydrofoil will fit my engine?
A: This hydrofoil is a universal fit for most outboard and sterndrive motors between 40 and 300 HP. However, you must check the incompatibility list. It will not fit Mercury 40 HP 4-Stroke engines, Mercury Bravo II drives, Bravo III drives with a single anode, Volvo Penta drives with exhaust through the cavitation plate, Honda outboards over 200 HP, or Yamaha outboards at 350 HP.

Q: What benefits can I expect after installation?
A: The hydrofoil is designed to get your boat on plane faster, which can improve fuel economy. It also provides greater stability by reducing porpoising (the boat's bow bouncing up and down) and minimizing cavitation.

Q: Is drilling into my engine's cavitation plate required?
A: Yes, this is a bolt-on hydrofoil that requires drilling four holes into the cavitation plate. A drill bit and all necessary mounting hardware are included in the package to complete the installation.

Q: Will this fit my Mercury Bravo II sterndrive?
A: No, this model is explicitly listed as incompatible with Mercury Bravo II sterndrives.

Q: OEM vs. Aftermarket?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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 & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify 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.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.