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 (Replaces SE Sport 300, 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.
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Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern ...
Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40–350 HP (Replaces SE Sport 300, FO2003) is backordered and will ship as soon as it is back in stock.
Product Details
This Whale Tail Hydrofoil Stabilizer is designed to improve performance and stability for most outboard motors and stern drives from 40 HP to 350 HP, including both 2-Stroke and 4-Stroke engines. Its dorsal fin style enhances handling, reduces cavitation, and allows the boat to plane at lower speeds, improving fuel efficiency.
This unit is a direct aftermarket interchange for SeaSierra FO2003, SEASIERRA 300HS, NorthBoat FO2003, SE Sport 300, HD300 Whale Tail Stabilizer, and XRmarine Sport-300.
- Mounts directly to the anti-ventilation plate (requires drilling).
- Constructed from UV-resistant, high-impact marine grade plastic.
- 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 |
|---|---|
| Sea Sierra | FO2003 |
| Sea Sierra | 300HS |
| NorthBoat | FO2003 |
| SE Sport | 300 |
| XRmarine | Sport-300 |
| HD | 300 Whale Tail Stabilizer |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This hydrofoil offers universal fitment for most major outboard brands within the 40–350 HP range. No OEM approval is implied.
| Brand | Rated HP | Stroke | Notes |
|---|---|---|---|
| Mercury/Mariner | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
| Yamaha | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
| Johnson/Evinrude | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
| Suzuki | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
| Honda | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
| Tohatsu/Nissan | 40-350 | 2-Stroke & 4-Stroke | Aftermarket fit for all compatible models. |
Fitment is also universal for most MerCruiser and OMC stern drives. For select Volvo Penta models, special hardware is required.
| Brand | Model | Rated HP | Notes |
|---|---|---|---|
| MerCruiser | Compatible models | 40-350 | Aftermarket fit. |
| OMC | Compatible models | 40-350 | Aftermarket fit. |
| Volvo Penta | SX-A, DPS, DPR, DPH, 280, 290 series | 40-350 | Requires longer bolts and 1" fender washers. Not compatible with Volvo Ocean Series XDP. |
Technical Specs
- Product Type
- Hydrofoil Stabilizer, Dorsal Fin Style
- Installation
- Direct mount to anti-ventilation plate with included hardware (requires drilling)
- Fuel Type
- Gasoline (compatible with all engine fuel types)
- Connection
- Bolt-on (requires drilling)
- Housing Material
- Marine Grade Nylon-PA66 Plastic
- Housing Color
- Available in Black, Blue, Red, or Silver
- Dimensions
- H: 17 inches (43.18 cm) × W: 14.4 inches (36.58 cm)
- Weight
- 1.79 kg (3.95 pounds)
- Fitting Type
- Bolted attachment
- Warranty
- 1 year against manufacturing defects (typical for aftermarket parts)
- Other Technical Attributes
- UV-resistant construction; enhanced impact resistance
What’s in the Box
- 1 x Hydrofoil Stabilizer
- 4 x Sets of Stainless Steel Screws and Nuts
- 1 x 6.5mm Drill Bit
- 1 x Installation Instructions
Installation Notes
- Ensure the engine is off and the battery is disconnected. Secure the outboard motor in a tilted position to access the anti-ventilation plate.
- Position the hydrofoil onto the anti-ventilation plate. Ensure it is centered and does not interfere with the propeller's movement.
- Use a marker or punch to mark the four drill hole locations on the plate through the holes in the hydrofoil.
- Remove the hydrofoil and carefully drill the marked holes using the included 6.5mm drill bit.
- Apply a marine-grade sealant around the drilled holes to prevent water intrusion and corrosion.
- Align the hydrofoil with the holes, insert the stainless steel bolts, and secure them with the provided nuts.
- Tighten the nuts evenly until the hydrofoil is firmly secured. Do not overtighten, as this can crack the plastic housing or damage the plate.
- After the first water test, re-check the hardware to ensure it remains tight.
Troubleshooting & FAQ
Will this hydrofoil fit my specific engine model?
This hydrofoil is designed for universal fitment on most outboard and stern drive engines from 40 to 350 HP. Please review the compatibility tables. For Volvo Penta drives, note the specific requirements for bolts and washers. Always verify your anti-ventilation plate has sufficient flat surface area for mounting.
What performance benefits can I expect?
A properly installed hydrofoil helps your boat get on a plane faster, especially with heavy loads. It can also maintain planing at lower speeds, reduce or eliminate porpoising and cavitation, and improve stability and handling in turns.
How difficult is the installation process?
Installation is straightforward for those comfortable with basic tools. It involves drilling four holes into your engine's anti-ventilation plate. The package includes the necessary drill bit and hardware. If you are unsure, we recommend professional installation.
Will drilling holes void my engine's warranty?
Modifying any part of your engine, including drilling into the anti-ventilation plate, may affect its warranty. We recommend checking with your engine manufacturer or dealer if your motor is still under warranty.
What is the difference between this model and the SE Sport 300?
This is an aftermarket replacement built to the same specifications for fitment and performance as the SE Sport 300 and other equivalents. It is made from similar durable, marine-grade materials to ensure longevity and effectiveness.
How do I know if the hydrofoil is working correctly?
You should notice a significant improvement in the time it takes to get on plane. The boat should feel more stable at speed, and you may observe less bow rise upon acceleration. The engine may also be able to maintain a plane at a lower RPM, contributing to fuel savings.
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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