11" Propeller Safety Guard – Fits Mercury, Yamaha, Honda, Suzuki 25-35 HP Outboards (Replaces SeaSierra SP62811, PropSafe/PropGuard PS-11O, Sea Sierra Marine 11" Guard)
11" Propeller Safety Guard – Fits Mercury, Yamaha, Honda, Suzuki 25-35 HP Outboards (Replaces SeaSierra SP62811, PropSafe/PropGuard PS-11O, Sea Sierra Marine 11" Guard) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
11" Propeller Safety Guard – Fits Mercury, Yamaha, Honda, Suzu...
Product Details
This 11" Propeller Safety Guard provides protection for your propeller and enhances performance on outboard motors from 25 to 35 HP. It is compatible with a wide range of Mercury, Yamaha, Honda, BRP, and Suzuki engines using standard gearcases and propellers up to 10.5 inches in diameter. Please note, this guard is not recommended for Big Foot or High Thrust applications, which require a 13-inch model.
This guard directly interchanges with SeaSierra SP62811, PropSafe/PropGuard PS-11O, and JLM Marine 11" Guard.
- Installs directly to the cavitation plate and skeg with included hardware.
- Molded from high-strength polypropylene/polycarbonate for durability in marine environments.
- Improves boat handling and acceleration while reducing stress on the hull and engine.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| SeaSierra | SP62811 |
| PropSafe/PropGuard | PS-11O |
| JLM Marine | 11" Guard |
Engine & Model Compatibility
Confirm your engine model and horsepower in the table below. This guard is designed for standard gearcases only.
Mercury/Mariner: Fits 25-35 HP models with a standard gearcase. Not for Big Foot models.
Yamaha: Fits 25-35 HP models with a standard gearcase. Not for High Thrust (T25/T30) models.
Honda: Fits 25-35 HP 4-Stroke models with a standard gearcase.
Suzuki: Fits 25-35 HP models with a standard gearcase.
BRP (Johnson/Evinrude): Fits 25-35 HP models with a standard gearcase.
| Brand | Rated HP | Stroke | Notes |
|---|---|---|---|
| Mercury/Mariner | 25 HP | 2 & 4-Stroke | Standard gearcase only, not for Big Foot |
| Mercury/Mariner | 30 HP | 2 & 4-Stroke | Standard gearcase only, not for Big Foot |
| Mercury/Mariner | 35 HP | 2 & 4-Stroke | Standard gearcase only |
| Yamaha | 25 HP | 2 & 4-Stroke | Standard gearcase only, not for High Thrust |
| Yamaha | 30 HP | 2 & 4-Stroke | Standard gearcase only, not for High Thrust |
| Yamaha | 35 HP | 2 & 4-Stroke | |
| Honda | 25 HP | 4-Stroke | Standard gearcase only |
| Honda | 30 HP | 4-Stroke | Standard gearcase only |
| Honda | 35 HP | 4-Stroke | |
| Suzuki | 25 HP | 2 & 4-Stroke | Standard gearcase only |
| Suzuki | 30 HP | 2 & 4-Stroke | Standard gearcase only |
| Suzuki | 35 HP | 2 & 4-Stroke | |
| Johnson/Evinrude | 25 HP | 2 & 4-Stroke | Standard gearcase only |
| Johnson/Evinrude | 28 HP | 2-Stroke | |
| Johnson/Evinrude | 30 HP | 2 & 4-Stroke | Standard gearcase only |
| Johnson/Evinrude | 35 HP | 2 & 4-Stroke |
Technical Specs
- Product Type
- Propeller Safety Guard
- Installation
- Bolt-on (hardware included)
- Connection
- Mounting to cavitation plate and skeg
- Housing Material
- High-strength polypropylene/polycarbonate plastic with stainless steel hardware
- Housing Color
- Safety Orange
- Dimensions
- 11 inches diameter, 9 × 11 × 12 inches overall
- Weight
- 1.998 kg (4.4 lbs)
- Fitting Type
- Direct bolt-on
- Thread Size
- Varies by installation hardware
- Performance Benefits
- Increases propeller efficiency and boat acceleration; improves boat handling; reduces marine hull stress and engine stress
What’s in the Box
- 1 × 11-inch Polycarbonate Propeller Guard (Safety Orange)
- 8 × Sets of Installing Bolts
- 1 × Drill Bit
Installation Notes
Installation can be completed in approximately 30 minutes with basic tools.
- Position the guard on the underside of the cavitation plate, ensuring there is equal distance between the guard and the propeller blades.
- Place the guard as far forward on the cavitation plate as possible.
- If present, remove the trim tab from under the cavitation plate before installation.
- Drill four holes through the cavitation plate, using the guard as a template.
- Insert bolts, washers, and Nyloc nuts through the four cavitation plate holes and loosely tighten.
- Drill one hole through the lower skeg, aligning with the guard's rear mounting point. Insert the bolt, washer, and Nyloc nut, and tighten it securely.
- Fully tighten the four cavitation plate bolts.
Important: This propeller guard is not recommended or warranted for boat speeds over 25-30 mph.
Troubleshooting & FAQ
Will this guard fit my 40 HP engine?
No, this 11-inch guard is designed specifically for outboards in the 25-35 HP range. A larger, more powerful engine requires a correspondingly larger and stronger guard to ensure safety and proper function.
Is this compatible with a Mercury Big Foot or Yamaha High Thrust lower unit?
No, this model is engineered for standard gearcases only. Big Foot and High Thrust applications have larger gearcases and propellers, and require a 13-inch guard.
What tools are required for installation?
You will need basic hand tools (wrenches) and a power drill. The package includes all necessary mounting hardware (bolts, nuts, washers) and the correct size drill bit, making installation straightforward.
Can I operate my boat at high speeds with the guard installed?
The guard is not recommended or warranted for speeds exceeding 25-30 mph. Operating at higher speeds can create excessive drag and stress on the guard and its mounting points, potentially leading to failure.
How does the guard improve performance?
The guard's shape channels water directly into the propeller, which can increase thrust and overall efficiency. This often results in better acceleration and improved boat handling, particularly at lower speeds, while also reducing stress on the hull and engine components.
What is the guard made from?
The guard is molded from a high-impact, UV-stable polypropylene/polycarbonate plastic blend to withstand the harsh marine environment. All included installation hardware is stainless steel to prevent rust and corrosion.
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 and specifications against your original part before purchasing. If anything differs—even if your model appears compatible—do not purchase.
- This product is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is strongly recommended to ensure safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days, with expedited options available.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we offer fair pricing without compromising on materials or quality control.
Payment & Security
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