YOUNG MARINE OEM Grade Aluminum Outboard Propeller 10 1/2in - Reliable

In this review of the YOUNG MARINE OEM grade aluminum outboard propeller, the bottom line is simple: boat owners with Mercury 30-70HP engines who need a reliable, OEM-dimension replacement will find strong value here. The prop is an aftermarket part built to the same diameter and pitch as the original, and our review emphasizes fit and real-world performance as the main reasons to buy. Installers appreciate the straightforward fit, and operators report solid RPM and a modest speed gain on compatible motors.

Key Features

• OEM-equivalent size: Diameter 10 1/2in and pitch 13in match original specifications for a direct replacement without driveline changes.
• 13 spline tooth: The 13 spline interface ensures correct engagement with Mercury lower units specified for this spline count, reducing the chance of slippage.
• High quality aluminum: The aluminum construction balances corrosion resistance and durability while keeping weight low for predictable handling.
• Improved blade shape: Redesigned blades aim to preserve or slightly improve top speed and RPM characteristics compared with older originals.
• Wide compatibility: Built for Mercury outboard engines in the 30-70HP range, making it suitable for many small to mid-size boats.

Who It's For

This propeller suits owners of Mercury 30-70HP outboards who need a direct, affordable replacement that matches the original 10 1/2in x 13in dimensions. It is particularly well suited to recreational boaters, fishermen, and anyone who values ease of installation and predictable RPM behavior.

Those who should look elsewhere include operators who require a specialized stainless steel prop for heavy-duty commercial use or who need an alternative pitch for specific towing or heavy-load applications. Also consider a professional propeller shop if custom trimming or re-pitching is required.

Pros & Cons

Pros

• Good fit for compatible Mercury engines, with multiple users reporting simple installation and correct engagement.
• Solid build quality from high quality aluminum that balances weight and corrosion resistance.
• Reports of improved speed and RPM on some motors indicate effective blade geometry.
• Cost effective OEM-dimension alternative to pricier branded replacements.

Cons

• Aftermarket product rather than factory OEM, so finish and minor fit variations can occur between units.
• Aluminum is less damage-resistant than stainless steel for owners who often strike debris or shallow bottoms.

Specifications

Diameter	10 1/2in
Pitch	13in
Spline	13 spline tooth
Reference number	48-816704A45
Material	High quality aluminum
Compatible engines	Mercury outboards 30-70HP

Our Verdict

The YOUNG MARINE 10 1/2in x 13in propeller is a practical, value-focused replacement for Mercury 30-70HP owners who want OEM-matching dimensions and reliable on-water performance. It delivers good build quality, easy installation, and measurable speed and RPM benefits for many users, making it a sensible buy for recreational boaters who do not require stainless steel toughness.

Frequently Asked Questions

Will this prop fit my Mercury 50HP 4-stroke?
Yes, the 13 spline and 10 1/2in x 13in dimensions match many Mercury 50HP 4-stroke lower units; check your spline count before ordering.

Is this an OEM part?
This is an aftermarket propeller built to OEM-equivalent diameter and pitch, not an original factory part.

How durable is the material?
Made from high quality aluminum, it balances corrosion resistance and weight but is not as impact-resistant as stainless steel.