Gale Model 5S12 Outboard Motor Specs & Overview

Gale Products, a division of the Outboard Marine Corporation (OMC), played a pivotal role in post-WWII recreational boating. Gale manufactured reliable, no-frills outboard motors both under their own brand name and for major retailers under private labels like Montgomery Ward (Sea King) and Western Auto (Wizard). The Gale Model 5S12 is a classic example of a mid-century, lightweight utility outboard—engineered for dependable trolling, lightweight durability, and straightforward mechanical service.

Technical Specifications: Gale Model 5S12

• Model: 5S12
• Horsepower: 5.0 HP @ 4,000 RPM (O.B.C. Certified)
• Cylinders: 2-cylinder, alternate firing
• Displacement: 8.84 cubic inches
• Bore & Stroke: 1-15/16″ Bore x 1-1/2″ Stroke
• Powerhead Type: 2-Cycle, 2-Port
• Ignition System: Built-in Flywheel Magneto
• Carburetor: Variable Venturi
• Speed Control: Single lever synchronized throttle and spark
• Cooling System: Positive displacement synthetic rubber rotor pump
• Gear Ratio: 13:20
• Gearshift Control: 360° Full Reversing
• Propeller: 2-Blade, 7-1/2″ Diameter x 7-1/4″ Pitch
• Fuel Tank Capacity: 0.8 Gallons (Integral)
• Running Time: Approx. 1 Hour at wide-open throttle
• Starter: Automatic Rewind
• Weight: 45 lbs
• Recommended Transom Height: 15″ (Standard Short Shaft)

Restoration, Maintenance & Fuel Mix Guidelines

Restoring and maintaining a vintage Gale 5S12 requires attention to a few critical areas to keep it running smoothly and reliably on the water.

2-Stroke Fuel/Oil Mix Ratio:
Do not use modern 50:1 pre-mix ratios on these vintage motors. Given the internal bearing designs of mid-century outboards, run a 24:1 gas-to-oil mixture (approx. 2/3 cup or 5.3 oz of TC-W3 rated 2-stroke oil per gallon of gasoline). Always opt for non-ethanol regular gasoline whenever possible, as ethanol breaks down legacy rubber fuel lines, cork floats, and internal gaskets.

Ignition System Service:
The flywheel magneto ignition is straightforward to service. If you experience weak or intermittent spark, remove the flywheel to clean and adjust the contact breaker points (typically gapped to .020″). Inspect the coils for cracking, a common issue with aged original OMC components. Modern replacement coils and condensers are widely available and relatively easy to retrofit.

Cooling System Care:
The cooling system utilizes a positive displacement synthetic rubber rotor impeller. Never run the motor out of water, even briefly, as dry running will tear the rubber blades apart instantly. If the engine has been sitting idle for years, replace the impeller before your first water test to prevent powerhead overheating.

Gearcase & Reversing Operation:
The 5S12 uses a 360° full reversing system rather than a mechanical shift transmission. To go in reverse, you rotate the entire engine 180 degrees using the tiller handle. Keep the swivel bracket greased so it turns effortlessly. Drain and inspect the lower unit gear lubricant seasonally; look for milky oil which indicates water intrusion past the propeller shaft or drive shaft seals.