Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40–350 HP (Replaces SE Sport 300, FO2003)

Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40–350 HP

This dorsal fin-style hydrofoil stabilizer is designed for most outboard motors and stern drives ranging from 40 HP to 350 HP, including both 2-stroke and 4-stroke engines. It enhances performance by providing lift, reducing planing time, and improving stability.

This unit serves as a direct aftermarket replacement for several models, including the SeaSierra FO2003, SEASIERRA 300HS, NorthBoat FO2003, SE Sport 300, HD300 Whale Tail Stabilizer, and XRmarine Sport-300.

• Installation Method: Mounts directly to the anti-ventilation plate (requires drilling).
• Durable Construction: Made from marine-grade, UV-resistant Nylon-PA66 plastic for enhanced impact resistance.
• Complete Kit: Includes all necessary stainless steel mounting hardware and a drill bit for installation.

Part Number Cross-Reference

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

Compatible Engine Models

Confirm your engine model/year in the tables below.

Universal Outboard Compatibility

Universal Stern Drive Compatibility

Technical Specifications

Package Contents

• 1 x Hydrofoil Stabilizer
• 4 x Sets of Stainless Steel Screws and Nuts
• 1 x 6.5mm Drill Bit
• 1 x Installation Instructions

Installation Guide

1. Safety First: Ensure the engine is off, the key is removed, and the shifter is in neutral. Disconnect the battery for added safety.
2. Center the Hydrofoil: Place the hydrofoil on top of the engine's anti-cavitation plate. Align it so it is perfectly centered.
3. Mark Drill Holes: Use a marker or punch to mark the four drill hole locations on the anti-cavitation plate through the mounting holes of the hydrofoil.
4. Drill the Holes: Remove the hydrofoil. Using the included 6.5mm drill bit, carefully drill the four marked holes through the plate.
5. Secure the Hydrofoil: Place the hydrofoil back onto the plate. Insert the stainless steel bolts from the top and secure them from underneath using the provided nuts.
6. Tighten Hardware: Evenly tighten all four sets of screws and nuts. Do not overtighten, as this could damage the plate or hydrofoil. Check for a snug and secure fit.

Troubleshooting & FAQ

Q: How do I install this hydrofoil on my engine?
A: Installation requires drilling four holes into your outboard or stern drive's anti-cavitation plate. The package includes a 6.5mm drill bit and all necessary stainless steel hardware. We recommend professional installation if you are not comfortable with this process.

Q: My stern drive is a Volvo Penta. Will this fit?
A: It fits most Volvo Penta SX-A, DPS, DPR, DPH, 280, and 290 series drives. However, you will need to source longer bolts and 1-inch fender washers for a secure fit. It is not compatible with the Volvo Ocean Series XDP.

Q: Is this the same as an SE Sport 300?
A: This product is an aftermarket part designed to be a direct replacement for the SE Sport 300 and several other hydrofoil models. It is built to the same fitment and performance specifications using comparable high-strength materials.

Q: What are the signs I might need a hydrofoil?
A: A hydrofoil can help if your boat struggles to get on plane, experiences porpoising (the bow bouncing up and down), or has poor handling and stability at speed. It provides stern lift to address these issues.

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.