Gale Model 35DE12 Outboard Motor Specs & Overview

Gale Products, a division of Outboard Marine Corporation (OMC), produced some of the most dependable and accessible outboard motors of the mid-20th century. Utilizing much of the same robust internal engineering as its sister brands, Johnson and Evinrude, Gale outboards offered boaters high performance without unnecessary frills. The Gale Model 35DE12 (and its sibling 35DE11) represents the pinnacle of Gale’s big-block twin-cylinder lineup, delivering a solid 35 horsepower from a proven 40.5 cubic inch powerhead. Equipped with full gearshift control, electric starting, and an automotive-style electric choke, this mid-century classic was designed for family runabouts, utility craft, and water-skiing.

Key Technical Specifications

• Model: 35DE12 (and 35DE11)
• Horsepower: 35.0 HP @ 4,500 RPM (O.B.C. Certified)
• Operating Range: 4,000 – 5,000 RPM
• Displacement: 40.5 cubic inches
• Bore & Stroke: 3-1/16″ x 2-3/4″
• Cylinders: 2-cylinder, alternate firing
• Powerhead Type: 2-cycle, 2-port
• Ignition: Built-in flywheel magneto
• Carburetor: Concentric float type with adjustable fast/slow speed needle valves and electric automotive-type choke
• Starter: 12V Electric starting with automatic rewind manual backup
• Gearshift: Forward – Neutral – Reverse (F-N-R)
• Gear Ratio: 12:21
• Propeller: 3-Blade, 10-3/8″ x 13-1/4″
• Cooling System: Positive displacement and centrifugal synthetic rubber rotor pump
• Fuel Capacity: 6-gallon remote tank (Approx. 1.5 to 1.75 hours run time at WOT)
• Weight: 134 lbs (dry, less tank)
• Recommended Transom Height: 15″ (Standard Short Shaft)

2-Stroke Fuel/Oil Mix Guidelines

Because mid-century OMC powerheads utilize bronze bushing bearings on key internal components, proper lubrication is critical to prevent engine damage.

• Recommended Fuel Mix: Use a 24:1 ratio of fuel to oil. This translates to 1 quart (32 oz) of high-quality TC-W3 marine two-stroke oil per 6 gallons of gasoline.
• Fuel Selection: Modern ethanol-blended gasolines (E10) absorb moisture and break down vintage fuel lines and carburetor gaskets. Always use 87 or 89 octane non-ethanol (E0) marine or recreational gasoline whenever possible.

Maintenance & Restoration Tips

Restoring a Gale 35 HP outboard is a rewarding project due to excellent parts availability and straight-forward mechanical design. Pay close attention to these vital systems during restoration:

1. Ignition System:
The flywheel magneto system relies on dual coils, breaker points, and condensers. Original OMC coils from this era are notorious for cracking due to age. Replace them with modern epoxy-encapsulated OMC/Universal ignition coils. Set the breaker point gap to precisely .020 inches at high lobe peak.

2. Cooling System Impeller:
Never start the motor dry. The lower unit houses a synthetic rubber impeller that hardens and degrades over time. Always replace the water pump impeller before putting a revived motor into service. Ensure the rubber grommets on the water delivery tube seal correctly during lower unit reassembly to prevent cooling pressure loss.

3. Carburetor & Fuel Delivery:
The concentric float carburetor features both high-speed and low-speed adjustable needle valves. To establish a baseline setting for starting, open the low-speed needle valve 1.5 turns out from light seat, and the high-speed needle 1 turn out. Fine-tune both needles under load while the engine is warm on the water. Check the electric choke solenoid wiring for frayed insulation and proper grounding.

4. Gearcase Maintenance:
Inspect the lower unit oil for milkiness, which indicates water intrusion through the propeller shaft seal, shift rod seal, or drive shaft seal. Drain and refill the gearcase using modern 80W-90 marine lower unit lubricant, replacing the drain plug washers with fresh fiber seals to prevent leaks.