Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces NorthBoat FO2003, UANOFCN FO2003)
Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces NorthBoat FO2003, UANOFCN FO2003) is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
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.
Tracking information will be provided once your order ships.
Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-300 HP (Replaces NorthBoat FO2003, UANOFCN FO2003) is backordered and will ship as soon as it is back in stock.
Product Details
The NorthBoat FO2003 Whale Tail hydrofoil stabilizer is designed to significantly improve performance for outboard motors and stern drives ranging from 40 to 300 HP. It enhances stability, reduces porpoising, and allows the boat to get on plane faster for a smoother, more efficient ride.
This part is a direct replacement for NorthBoat FO2003 and UANOFCN FO2003.
- Installs via drilling and bolting onto the cavitation plate.
- Constructed from marine-grade reinforced nylon PA66 plastic for durability.
- Features a crescent-shaped design for improved water flow and thrust.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| NorthBoat | FO2003 |
| UANOFCN | FO2003 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Notes |
|---|---|---|---|---|
| Universal | Outboard Motors | 40–300 HP | 2 & 4-Stroke | Except Mercury 4-Strokes 40, 50, 60 HP |
| Universal | Stern Drives | 40–300+ HP | 4-Stroke | Not recommended for Volvo Ocean Series XDP |
| Mercury | 4-Stroke | 40–60 HP | 4-Stroke | Not compatible |
| Mercury | Bravo II | Not compatible | ||
| Mercury | Bravo III | Only compatible with one anode on bottom of cavitation plate (rare configuration) | ||
| Honda | Outboards | 200+ HP | Not compatible | |
| Yamaha | Outboards | 350 HP | Not compatible | |
| Volvo | SX-A, DPS, DPR, DPH series | Requires longer bolts and 1" fender washers | ||
| Volvo | 280 and 290 series | Requires longer bolts and 1" fender washers; will fit under Volvo's top mounted anode by reversing anode to wide end forward | ||
| Volvo | Ocean Series XDP | Not recommended | ||
| Volvo | Models with exhaust through cavitation plate | Not compatible |
Technical Specs
- Product Type
- Hydrofoil Stabilizer
- Installation
- Drill-mounted to cavitation plate
- Connection
- Bolt-on with included hardware
- Housing Material
- Marine-grade reinforced nylon PA66 plastic
- Housing Color
- Silver (also available in other colors)
- Dimensions
- H: 13.5" (343mm) × W: 14" (356mm) to 17" (432mm) [some dimensional variation between sources]
- Weight
- 3.4 lbs (1.54 kg)
- Fitting Type
- Bolted
- Other Technical Attributes
- Crescent-shaped design for improved water flow and thrust
What’s in the Box
- 1 x Hydrofoil Stabilizer (FO2003)
- 4 x Sets Stainless Steel SS316 Screws and Nuts
- 1 x 6.5mm Drill Bit
- 1 x Installation Instructions
Installation Notes
- Position the hydrofoil stabilizer on the anti-cavitation plate of your outboard motor or stern drive, ensuring it is centered.
- Mark the locations for the four mounting holes on the plate using the hydrofoil as a template.
- Carefully remove the hydrofoil and drill the marked holes using the included drill bit.
- Securely fasten the hydrofoil to the plate using the provided stainless steel screws and nuts. Tighten until snug, avoiding over-tightening to prevent damage to the plate.
Troubleshooting & FAQ
Will this hydrofoil fit my engine?
This stabilizer is designed for universal fitment on most outboard and stern drive motors from 40 to 300 HP. However, there are known exceptions, such as certain Mercury, Honda, Yamaha, and Volvo models. Please review the compatibility table carefully to ensure it does not exclude your specific engine.
Is drilling required for installation?
Yes, installation requires drilling four holes into your engine's anti-cavitation plate. All necessary mounting hardware, including stainless steel bolts and a drill bit, are included in the package.
What are the signs that my boat could benefit from this stabilizer?
Common issues like porpoising (the bow bouncing up and down), cavitation (propeller losing grip), chine walking at high speeds, and slow planing time are strong indicators that a hydrofoil stabilizer can improve your boat's performance and handling.
How does this improve fuel economy?
By allowing the boat to get on plane at a lower speed and stay on plane at lower RPMs, the engine works less hard, resulting in reduced fuel consumption during cruising.
Can I install this on a Volvo Penta drive with an exhaust through the cavitation plate?
No, this model is not compatible with any sterndrive models that feature an exhaust port through the cavitation plate.
Are longer bolts required for my Volvo Penta drive?
For Volvo SX-A, DPS, DPR, DPR, 280, and 290 series drives, you will likely need longer bolts and 1" fender washers for a secure fit, which are not included in the standard kit.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9001 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
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
