Description
2005 Mercury 50HP 2-Stroke Outboard Motor is a lightweight, mid-power marine engine widely used on fishing boats, jon boats, utility boats, and small commercial vessels. Built on Mercury’s proven inline-4 loop-charged 2-stroke platform, this engine is known for its strong acceleration, simple mechanical design, and excellent power-to-weight ratio compared to modern 4-stroke engines. It delivers quick throttle response and good mid-range torque, making it ideal for shallow water running, river fishing, and general-purpose boating.
This engine typically uses a carbureted fuel system (or early EFI in some variants), oil injection (or pre-mix depending on model), and a robust mechanical gearcase designed for durability. Mercury engineered this series for reliability and ease of maintenance, which is why many units from this era are still in service today.
Key Features
50 Horsepower Inline-4 2-Stroke Engine
Loop-Charged Performance Design
Carbureted Fuel Delivery System (EFI on select variants)
Oil Injection Lubrication System (or Pre-Mix)
Electric Start System
Remote or Tiller Steering Options
Power Trim & Tilt (on select models)
Water-Cooled Thermostat System
CDI Electronic Ignition
Through-Prop Exhaust System
Lightweight Marine Construction
Strong Low-End Torque Output
Fast Hole-Shot Acceleration
Simple Mechanical Design for Easy Repairs
Saltwater-Resistant Components
Heavy-Duty Aluminum Gearcase
Forward / Neutral / Reverse Gear System
Shallow Water Drive Capability
Reliable Cold Starting Performance
External Fuel Tank Compatibility
Long Shaft & Short Shaft Variants
Commercial & Recreational Use Design
Good Fuel Efficiency for a 2-Stroke
High Power-to-Weight Ratio
Easy Maintenance & Parts Availability
Designed for Mid-Size Fishing Boats
Technical Specifications (Typical for 2005 Mercury 50HP 2-Stroke)
- Engine Type: Inline 4-Cylinder, 2-Stroke
- Horsepower: 50 HP
- Displacement: ~967cc–995cc
- Fuel System: Carburetor (some EFI variants exist)
- Ignition: CDI Electronic Ignition
- Starting System: Electric Start
- Cooling System: Water-Cooled
- Gear Shift: Forward / Neutral / Reverse
- Gear Ratio: ~1.83:1
- Full Throttle Range: ~5000–6000 RPM
- Fuel Type: Petrol (gasoline)
- Oil System: Oil Injection or Pre-Mix (model dependent)
- Shaft Lengths: 15″, 20″, 25″ options
- Dry Weight: ~180–250 lbs depending on configuration
- Steering: Tiller or Remote Control
