Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces FO2003)
Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces FO2003) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-3...
Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces FO2003) is backordered and will ship as soon as it is back in stock.
Product Details
This Whale Tail Hydrofoil Stabilizer is a versatile performance-enhancing attachment designed for a wide range of outboard motors and stern drives from 40 to 300 HP. It provides improved stability, reduced cavitation, faster planing, and better fuel efficiency for brands including Mercury, Yamaha, Johnson, Evinrude, Honda, and Suzuki, with some specific exceptions.
This part is a direct replacement for NorthBoat FO2003, SeaSierra 300, and QuickMarine or Marine Whale Tail Silver models.
- Installation is bolted to the cavitation plate and requires drilling.
- Constructed from UV-resistant, marine-grade reinforced Nylon PA66 plastic.
- The package includes all necessary stainless steel mounting hardware and a drill bit.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| NorthBoat | FO2003 |
| SeaSierra | 300 |
| QuickMarine | Whale Tail Silver |
| Marine | Whale Tail Silver |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Compatibility | Details |
|---|---|
| Compatible With |
|
| Not Compatible With |
|
Technical Specs
- Product Type
- Hydrofoil Stabilizer (Whale Tail)
- Installation
- Bolted to cavitation plate; drilling required
- Material
- Marine Grade Reinforced Nylon PA66 Plastic (UV-Resistant)
- Color
- Silver
- Dimensions
- H: 13.5 inches (343mm), W: 14 inches (356mm)
- Weight
- 2.94 lb (1.33 kg)
- Mounting Type
- Outboard/Sterndrive mount
- Engine Compatibility
- 40-300 HP outboards and stern drives
- Engine Type
- 2-Stroke & 4-Stroke
What’s in the Box
- 1 x Hydrofoil Stabilizer Board
- 4 x Sets of Stainless Steel Screws and Nuts
- 1 x 6.5mm Drill Bit
- 1 x Installation Instruction
Installation Notes
- For safety, disconnect the engine's battery or power supply before starting.
- Center the hydrofoil on the top side of the anti-cavitation plate.
- Mark the four drill locations through the mounting holes in the hydrofoil.
- Remove the hydrofoil and carefully drill the four marked holes with the included 6.5mm drill bit.
- Clean any metal shavings or burrs from the drilled holes.
- Place the hydrofoil back onto the plate, aligning it with the newly drilled holes.
- Insert the stainless steel bolts from the top and secure them with the nuts from the bottom.
- Tighten all four sets of hardware securely. Check for tightness before each use.
Troubleshooting & FAQ
How do I know if this hydrofoil will fit my motor?
This stabilizer fits most outboard and stern drive engines from 40 to 300 HP. Please review the "Not Compatible With" list to check for specific exclusions, such as certain Mercury 4-Stroke models, Mercury Bravo II/III drives, and high-HP engines from Honda and Yamaha.
What is the main benefit of installing a whale tail hydrofoil?
The primary benefit is improved performance. It helps the boat get on plane much faster and stay on plane at lower speeds. This action reduces bow rise, minimizes porpoising and cavitation, and can lead to better fuel economy.
Is drilling into my cavitation plate required?
Yes, this model requires drilling four holes into the motor's anti-cavitation plate to ensure a secure, permanent installation. The package includes all necessary mounting hardware and the correct size drill bit.
What are signs of an incorrect installation?
Symptoms of improper installation include unusual vibrations, poor handling, or the boat pulling consistently to one side. Verify the hydrofoil is perfectly centered on the cavitation plate and that all mounting hardware is fully tightened.
How often should I check the mounting hardware?
It is good practice to inspect the mounting bolts and nuts for tightness as part of your regular pre-launch safety check.
OEM vs. Aftermarket?
This 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.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered 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 & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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