Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 5-150 HP (Dorsal Fin Style)

Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 5-150 HP (Dorsal Fin Style)

This is a universal hydrofoil stabilizer designed for 5-150 HP outboard motors and stern drives, and it is suitable for most boats with engines up to 200 HP. Its dorsal fin design enhances stability and improves on-plane performance by reducing cavitation and porpoising.

This part is a direct replacement for SeaSierra 19HS, Uanofcn FO2001, and Davis Doel-Fin 440.

• Installation Method: Bolt-on (requires drilling)
• Material: Reinforced, UV-resistant Nylon PA66 plastic for durability
• Hardware: Includes a complete set of stainless steel mounting hardware

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Hydrofoil Stabilizer (Dorsal Fin Style)
• 4 x Stainless Steel Mounting Hardware Set (bolts, nuts)
• 1 x Installation Guide

Installation Guide

This hydrofoil requires drilling for installation. Professional installation is recommended. Always wear safety glasses and gloves during the process.

1. Step 1: Center the hydrofoil on the anti-cavitation plate of your outboard or stern drive. Ensure it is positioned correctly for optimal performance.
2. Step 2: Use a pencil or marker to mark the four drill points through the mounting holes of the hydrofoil onto the plate.
3. Step 3: Remove the hydrofoil and carefully drill the four marked holes through the anti-cavitation plate.
4. Step 4: Place the hydrofoil back onto the plate, align the holes, and securely fasten it using the included stainless steel bolts and nuts.

Troubleshooting & FAQ

Q: How do I know if this hydrofoil will fit my engine?
A: This stabilizer has a universal design for most 5-150 HP outboard motors and stern drives. However, it is not compatible with Volvo Penta 280/290 outdrives or BMW Outdrives for engines over 50HP. We recommend measuring your anti-cavitation plate to ensure the hydrofoil's dimensions (H: 260 mm, W: 210 mm) will fit before purchasing.

Q: Do I need to drill holes to install this part?
A: Yes, installation requires drilling four holes into the anti-cavitation plate of your lower unit. All necessary stainless steel mounting hardware is included in the package to complete the installation.

Q: What is the main benefit of the dorsal fin design?
A: The dorsal fin provides improved directional stability and better handling, especially during turns. It helps the boat get on plane quicker, reduces cavitation (propeller ventilation), and minimizes porpoising for a smoother, more efficient ride.

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.