Gale Model 35DE12B Outboard Motor Specs & Overview

Overview of the Gale 35DE12B Outboard Motor

Gale Products, a division of Outboard Marine Corporation (OMC), manufactured durable and reliable outboard motors from the late 1930s through the early 1960s. Sold directly and through major department store brands (such as Sea-King for Montgomery Ward and Sovereign), Gale outboards shared much of their core mechanical engineering with their Johnson and Evinrude counterparts.

The Gale Model 35DE12B is a 35-horsepower, twin-cylinder engine built during the height of the mid-century boating boom. Powered by a 40.5 cubic inch powerhead, this model combined electric starting, an electric choke, and full gearshift capabilities (Forward-Neutral-Reverse) into a solid, 134-pound package ideal for runabouts and utility boats of its era.

Key Technical Specifications

• Model: 35DE12B
• Horsepower: 35.0 HP @ 4,500 RPM (O.B.C. Certified)
• Operating Range: 4,000 – 5,000 RPM
• Powerhead Type: 2-cycle, 2-port, alternate firing twin
• Displacement: 40.5 cubic inches
• Bore and Stroke: 3-1/16″ x 2-3/4″
• Gear Ratio: 12:21
• Gearshift Control: Forward – Neutral – Reverse
• Propeller: 3-blade, 10-3/8″ x 13-1/4″
• Ignition System: Built-in flywheel magneto
• Starter: Electric start with automatic rewind (manual) backup
• Carburetor: Concentric float type with high and low-speed needle valves, plus electric choke
• Cooling System: Positive displacement and centrifugal synthetic rubber impeller
• Fuel Tank Capacity: 6 gallons (separate remote tank)
• Estimated Running Time: Approx. 1-1/2 to 1-3/4 hours at wide-open throttle
• Weight: 134 lbs. (excluding fuel tank)
• Recommended Transom Height: 15 inches

Restoration and Maintenance Guidelines

Restoring a Gale 35 HP outboard is a rewarding project due to the ready availability of OMC interchange parts. When bringing a vintage 35DE12B back to service, focus on these critical systems:

Cooling System: Never run this motor out of water. The synthetic rubber impeller inside the lower unit must be replaced before attempting to start an engine that has sat idle. Age causes the rubber vanes to become brittle, risk breaking off, and clog internal cooling passages.

Ignition System: The flywheel magneto uses dual ignition coils, points, and condensers. Inspect the coils for cracking in the plastic housings—a extremely common issue on OMC motors of this vintage. Adjust the ignition point gap to .020 inches and clean all electrical contacts thoroughly.

Carburetor & Fuel System: The concentric float carburetor features manually adjustable high and low-speed needle valves. Disassemble and clean all jet passages, replace old cork or rubber gaskets, and ensure the electric solenoid choke operates smoothly without dragging.

Fuel Mix and Lubrication Advice

Proper fuel-to-oil mixture is crucial to prevent mechanical failure on vintage two-stroke powerheads:

• Fuel Ratio: Use a standard 24:1 gas-to-oil mix (1 pint of oil per 3 gallons of gasoline, or 1 quart per 6-gallon tank). Do not attempt to run modern 50:1 lean mixtures on this motor, as internal sleeve bushings require heavy oil film protection.
• Oil Type: Always use modern high-grade Marine TC-W3 2-cycle outboard engine oil.
• Fuel Selection: Whenever possible, use 87+ octane non-ethanol (pure) gasoline. Ethanol attracts moisture, degrades vintage fuel lines, and damages fuel system diaphragms.
• Lower Unit Lubricant: Drain and refill the lower gearcase using standard Marine Hi-Vis Gear Lube (80W-90). Inspect old oil for milky discoloration, which indicates failing prop shaft or drive shaft seals.