Gale Model 5D21 Outboard Motor Specs & Overview

Gale Products, a division of the Outboard Marine Corporation (OMC), built a well-earned reputation during the mid-20th century for producing rugged, dependable, and accessible outboard motors. Often sold directly under the Gale “Buccaneer” badge or rebranded for major department stores like Montgomery Ward (Sea King), these motors shared underlying engineering with OMC’s flagship Johnson and Evinrude lines. The Gale Model 5D21 is a quintessential 5.0 HP two-cylinder outboard from this era, combining lightweight portability with modern conveniences like a full gearshift and a remote 6-gallon fuel tank.

Key Technical Specifications

• Model: Gale 5D21 (5D17-22 Series)
• Horsepower: 5.0 HP @ 4,000 RPM (O.B.C. Certified)
• Operating RPM Range: 3,500 – 4,500 RPM
• Cylinder Configuration: 2-cylinder, 2-port, alternate firing
• Bore & Stroke: 1-15/16″ Bore x 1-1/2″ Stroke
• Displacement: 8.84 cubic inches
• Gear Shift: Forward – Neutral – Reverse (F-N-R)
• Gear Ratio: 15:26
• Carburetor: Float feed with high and low-speed adjustment needles and automotive-type choke
• Ignition System: Built-in flywheel magneto
• Speed Control: Synchronized spark and throttle twist-grip control
• Cooling System: Rubber blade combination displacement and centrifugal water pump
• Propeller: 2-blade, 8″ diameter x 7-1/4″ pitch
• Starter: Automatic rewind recoil starter
• Fuel Capacity: 6-gallon remote tank
• Weight: 55 lbs (less fuel tank)
• Transom Fitment: Designed for 15″ or 20″ transoms

Fuel Mix & Lubrication Requirements

Like most vintage OMC two-stroke outboards from the 1950s, the Gale 5D21 requires a mixed fuel supply. Because this era’s powerheads utilize internal bronze bushings alongside needle bearings, running modern lean fuel ratios (like 50:1) will cause severe powerhead damage.

Recommended Mix Ratio: Use a 24:1 fuel-to-oil ratio (1 quart of high-quality TC-W3 2-stroke outboard oil to 6 gallons of regular gas). Always opt for ethanol-free gasoline whenever possible, as modern ethanol fuels break down vintage rubber components, attract moisture, and varnish carburetors during storage.

Restoration & Maintenance Tips

Because Gale shared standard OMC component designs, sourcing tune-up parts for the Model 5D21 is relatively easy today. Key restoration focus areas include:

• Ignition System Refurbishment: The flywheel magneto uses the classic OMC universal ignition system. Original green coils are prone to cracking with age. Replace cracked coils, set breaker points to .020 inches, and inspect the spark plug wires and condensers.
• Cooling System Care: Never run the motor dry. The lower unit houses a combination rubber blade water pump impeller. Due to age, old impellers harden or shed blades, leading to immediate overheating. Always replace the water pump impeller before bringing a revived motor back to the water.
• Carburetor Rebuild: The float-feed carburetor features adjustable high-speed (main) and low-speed (idle) mixture needles. Remove the carb, clean out gummed fuel passages, replace the packing washers around the needle shafts to prevent air leaks, and install a fresh cork or alcohol-resistant float.
• Lower Unit Lubrication: Drain and inspect the gearcase fluid. Look for milky oil, which indicates water intrusion past the propeller shaft or drive shaft seals. Refill with quality SAE 80W-90 marine gear lubricant.