Gale Model 5S10 Outboard Motor Specs & Overview

Overview of Gale Outboard Motors and the Model 5S10

Gale Products, a reliable division of the Outboard Marine Corporation (OMC), manufactured rugged, dependable outboards from the late 1930s through the early 1960s. Operating alongside sister brands Evinrude and Johnson, Gale focused on producing straightforward, no-nonsense motors that delivered exceptional value. In addition to selling under their own badge, Gale manufactured motors for major department store brands such as Montgomery Ward (Sea King) and Goodyear (Sea Bee).

The Gale Model 5S10 is a classic example of mid-century OMC engineering. Rated at 5.0 horsepower, this twin-cylinder, alternate-firing motor features a lightweight 45-pound design, an integrated top-mounted fuel tank, and 360-degree full-reversing steering. It remains a favorite among vintage motor collectors for its simplicity, ease of restoration, and smooth performance on light aluminum boats and cedar-strip fishing craft.

Technical Specifications

• Model: Gale 5S10
• Horsepower Rating: 5.0 HP @ 4000 RPM (O.B.C. Certified)
• Displacement: 8.84 Cubic Inches
• Cylinders: 2 (Alternate Firing)
• Bore and Stroke: 1-15/16″ Bore x 1-1/2″ Stroke
• Powerhead Type: 2-Cycle, 2-Port
• Weight: 45 Pounds
• Starter: Automatic Rewind
• Ignition: Built-in Flywheel Magneto
• Carburetor: Variable Venturi
• Speed Control: Single lever synchronized throttle and spark
• Cooling System: Positive displacement synthetic rubber rotor (impeller)
• Gear Ratio: 13:20
• Gearshift / Steering: 360° Full Reversing (pivot steering)
• Propeller: 2-Blade, 7-1/2″ Diameter x 7-1/4″ Pitch
• Fuel Tank Capacity: 0.8 Gallons (Integrated)
• Approximate Running Time: ~1 Hour per tank
• Transom Height: 15″ Standard Transom

Fuel Mix and Lubrication Guidelines

Proper fuel conditioning is crucial for keeping vintage 2-stroke outboards running smoothly and preventing internal damage:

• Fuel-to-Oil Ratio: Run a 24:1 ratio (1/2 pint of TC-W3 2-stroke outboard oil per 1.5 gallons of fuel). Vintage motors from this era utilize bronze bushings and plain bearings alongside needle bearings, requiring more oil protection than modern outboards.
• Fuel Type: Always use 87 or 90 octane ethanol-free gasoline. Ethanol can degrade vintage cork carburetor floats, dry out fuel lines, and attract moisture into the integrated tank.
• Lower Unit Lubricant: Use standard marine marine gear oil (80W-90) or traditional OMC Type C gear lubricant. Inspect the lower unit grease seals regularly to prevent water intrusion.

Maintenance & Restoration Advice

Restoring a Gale 5S10 is a rewarding project due to widely available OMC-compatible parts and straightforward mechanics. Keep these key maintenance tips in mind during your overhaul:

1. Ignition Tune-Up: The flywheel magneto system uses standard OMC components. Remove the flywheel to inspect the ignition coils, breaker points, and condensers. Vintage green OMC coils frequently crack over time; replacing them with modern epoxy-potted ignition coils will ensure a strong, reliable spark.

2. Cooling System Service: The positive displacement cooling pump utilizes a synthetic rubber rotor (impeller). Never run the engine dry, as running without water will quickly destroy the rubber blades. When restoring a long-stored motor, always drop the lower unit and install a fresh impeller before running the engine.

3. Integrated Fuel System: Because the 5S10 features a built-in 0.8-gallon gravity-fed fuel tank, ensure the tank interior is stripped of rust and varnish. Clean the internal sediment bowl filter screen and overhaul the variable venturi carburetor with fresh packing seals to prevent fuel leaks near the hot powerhead.

4. 360° Full-Reversing Operation: Since this model relies on 360-degree motor rotation rather than a neutral/reverse gearshift lever, ensure the swivel bracket is clean and well-greased via the grease fittings to allow smooth turning when reversing direction.