Sport-300 Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-350 HP

Sport-300 Whale Tail Hydrofoil Stabilizer – Fits Outboard Motors & Stern Drives 40-350 HP

This marine performance enhancer is designed for a wide range of outboard motors and stern drives from 40 to 350 horsepower. By mounting directly to the anti-ventilation plate, it delivers significant improvements in handling, planing speed, and overall fuel efficiency.

Directly replaces: SE Sport 300 HydroFoil, HD300 Whale Tail Stabilizer, and FO2003 Whale Tail Hydrofoil.

• Installation Method: Bolt-on (requires drilling into the anti-ventilation plate).
• Housing Material: Constructed from premium quality, UV-resistant Nylon-PA66.
• Included Hardware: Comes with stainless steel mounting screws, nuts, and a 6.5mm drill bit.

Compatible Engine Models

Confirm your engine model and horsepower in the tables below. For help identifying your specific engine, please use the guides linked below.

For Mercury/Mariner owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

For Yamaha owners, here’s a guide to help you identify your engine’s serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson Serial Number Guide.

For Suzuki owners, you can review exploded diagrams here to verify part numbers: Suzuki Parts Diagrams & Catalog.

Outboard Motors

Stern Drives

Technical Specifications

Package Contents

• 1 × Outboard Hydrofoil Stabilizer
• 4 × Sets of Stainless Steel Screws and Nuts
• 1 × 6.5mm Drill Bit
• 1 × Installation Instruction

Installation Guide

1. Safety First: Before starting, turn off the engine and disconnect the battery.
2. Position the Hydrofoil: Place the hydrofoil onto the anti-ventilation plate of your lower unit. Center it side-to-side, ensuring it doesn't interfere with the propeller's movement.
3. Mark the Holes: Use a pencil or marker to mark the four drill points through the mounting holes of the hydrofoil onto the plate.
4. Drill the Holes: Remove the hydrofoil. Carefully drill the four marked holes using the included 6.5mm drill bit.
5. Secure the Hydrofoil: Place the hydrofoil back onto the plate. Insert the stainless steel bolts from the top and fasten them securely with the nuts from the bottom.
6. Final Check: Ensure all bolts are tightened evenly and the hydrofoil is firm. Reconnect the battery.

Troubleshooting & FAQ

Q: How do I confirm if this hydrofoil fits my engine?

A: This stabilizer is designed for most outboard motors and stern drives from 40 to 350 HP. Please verify your engine's horsepower is within this range. Note the specific exclusions: it is not compatible with Mercury 40 HP 4-Stroke outboards or Volvo Penta Ocean Series XDP stern drives.

Q: What performance improvements can I expect?

A: This hydrofoil helps your boat get on plane faster, reduces porpoising and cavitation, improves stability and handling, and can enhance fuel efficiency at planing speeds.

Q: Is drilling required for installation?

A: Yes, this is a bolt-on part that requires drilling four holes into the engine's anti-ventilation plate. We include the necessary stainless steel hardware and a 6.5mm drill bit 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.