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 universal hydrofoil stabilizer is designed for a wide range of boats, fitting most 5-150 HP outboard motors and stern drives. Crafted from high-strength, reinforced Nylon PA66 plastic, it improves on-plane performance, stability, and handling. The unique dorsal fin design enhances tracking and control during turns.

It serves as a direct replacement for SeaSierra 19HS, Uanofcn FO2001, JLM Marine Hydrofoil Stabilizer, and HS001 Doel-Fin, offering broad compatibility with brands like Mercury, Yamaha, Honda, Suzuki, and Tohatsu. Note the specific exceptions for certain Volvo Penta and BMW models.

• Installation Method: Bolt-on (drilling is required).
• Included Hardware: Comes with stainless steel mounting bolts, nuts, washers, and a drill bit.
• Durable Construction: Made from UV-resistant, marine-grade reinforced plastic for longevity.

Part Number Cross-Reference

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

Compatible Engine Models

Confirm your engine model/year in the table below.

Technical Specifications

Package Contents

• 1 x Hydrofoil Stabilizer
• 4 x Sets of Stainless Steel Mounting Hardware (bolts, nuts, washers)
• 1 x Drill bit (6.5mm)
• 1 x Installation Instructions

Installation Guide

1. Safety First: Disconnect the boat's battery before starting any work on the engine.
2. Position the Hydrofoil: Place the two halves of the hydrofoil onto the anti-cavitation plate of your lower unit, ensuring a snug and centered fit.
3. Mark the Holes: Use a pencil or marker to mark the four drill locations through the mounting holes of the hydrofoil.
4. Drill the Holes: Remove the hydrofoil and carefully drill the four marked holes using the included 6.5mm drill bit.
5. Apply Sealant: For added protection against water intrusion, apply a small amount of marine-grade sealant around the drilled holes.
6. Secure the Hydrofoil: Position the hydrofoil halves back onto the plate and insert the stainless steel bolts. Secure them tightly with the provided washers and nuts.
7. Final Check: Ensure all hardware is firmly tightened and the hydrofoil is secure before reconnecting the battery and launching the boat.

Troubleshooting & FAQ

Q: How do I know if this hydrofoil will fit my engine?
A: This is a universal hydrofoil designed for most outboard and stern drive engines from 5 to 150 HP. Measure your engine's anti-cavitation plate to ensure the dimensions (H: 10-1/4", W: 8-1/4") will fit. Please note it is not compatible with Volvo Penta 280/290 outdrives or BMW outdrives for engines over 50HP.

Q: What is the benefit of the dorsal fin design?
A: The dorsal fin acts like a small keel to improve tracking and stability, especially during turns. It helps reduce prop ventilation (cavitation) and provides better handling at both low trolling speeds and when on plane.

Q: Is drilling always required for installation?
A: Yes. This is a bolt-on hydrofoil that requires drilling four holes into your engine's anti-cavitation plate. This ensures a secure and permanent installation. All necessary stainless steel hardware and a drill bit are included to simplify the process.

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.