1954 Evinrude 15 HP Super Fastwin Outboard Specs & Part Numbers
1954 Evinrude 15 HP Super Fastwin: Technical Guide & Restoration Reference
The 1954 Evinrude 15 HP Super Fastwin (Model 15012/15013) is an iconic representative of mid-century American marine engineering. Known for its robust build quality, smooth alternate-firing twin cylinder design, and classic styling, this motor remains a highly sought-after model for vintage outboard collectors and restorers alike. This technical guide provides comprehensive specifications, maintenance parameters, and historical context for servicing and restoring this classic powerplant.
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1. Overview & Technical Specifications
The 15 HP Super Fastwin was engineered during the post-WWII recreational boating boom. It features a die-cast aluminum block, a full gearshift (Forward, Neutral, Reverse), and utilizes Evinrude’s famous “Cruis-a-Day” pressurized fuel system.
| Parameter | Specification |
|---|---|
| Model Number(s) | 15012 (Standard Shaft), 15013 (Long Shaft) |
| Horsepower Rating | 15 HP @ 4000 RPM |
| Configuration | 2-Cylinder, 2-Stroke, Alternate Firing |
| Displacement | 19.94 cu. in. (326.8 cc) |
| Bore x Stroke | 2.375 in. x 2.250 in. (60.3 mm x 57.1 mm) |
| Cooling System | Water-cooled (positive displacement impeller pump) |
| Fuel/Oil Ratio | 24:1 (approx. 5.3 oz of TC-W3 oil per gallon of regular unleaded gasoline)* |
| Fuel Delivery | 2-Line Pressurized Fuel Tank (“Cruis-a-Day”) |
| Dry Weight | Approximately 74 lbs (33.5 kg) |
*Note on Fuel Ratio: While original 1954 documentation often recommended 1/2 pint of SAE 30 oil per gallon (16:1), modern high-quality TC-W3 two-stroke oils allow this needle-bearing engine to run safely at 24:1. Do not run 50:1, as this engine relies on the oil volume to protect its internal bronze bushings and early-style needle bearings.
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2. Common Maintenance & Tune-up Specs
To keep the Super Fastwin running reliably, periodic maintenance must be performed on the ignition system, fuel system, and lower unit gearcase.
Ignition System Specs (OMC Universal Magneto)
- Spark Plugs: Champion J6C (Modern replacement for the original J6J or J4J)
- Spark Plug Gap: 0.030 inches (0.76 mm)
- Breaker Point Gap: 0.020 inches (0.51 mm) at high point of cam
- Ignition Coils: Crucial replacement item. Original coils were insulated in a green/black plastic that cracks over time, leading to internal shorts. Replace with modern epoxy-molded OMC/BRP coils (Part # 580118 / 0580118).
- Condenser Capacity: 0.18 to 0.22 microfarads (Part # 580197)
Carburetor Adjustments
The carburetor is a simple float-feed unit equipped with low-speed (idle) and high-speed (main) adjustable needle valves.
- Initial High-Speed Needle Setting: 3/4 turn open from gently seated.
- Initial Low-Speed Needle Setting: 1-1/2 turns open from gently seated.
- Carburetor Rebuild Kit: OMC Part # 439071 (Includes needle, seat, float chamber gasket, and packing washers).
Cooling & Lower Unit
- Water Pump Impeller: Part # 375688 (Sierra replacement # 18-3005). Inspect annually. If the motor has sat unused for years, replace the impeller before attempting to run it to prevent catastrophic overheat.
- Gearcase Lubricant: Use OMC Type C (Premium Blend) or standard 80W-90 non-corrosive, marine-grade gear lube.
- Gearcase Capacity: Approximately 9 fl. oz. Fill from the bottom drain hole until grease flows out of the top level hole.
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3. Notable Features & Historical Significance
The 1954 Evinrude 15 HP Super Fastwin occupies an important place in marine engineering history. It bridged the gap between the heavy, loud utility outboards of the 1930s and 40s and the highly refined, quiet family motors of the late 1950s.
The “Cruis-a-Day” Pressure Tank System
Because the 1954 Super Fastwin lacks an internal mechanical fuel pump, it relies on a pressurized two-line fuel delivery system. One line pumps pressurized air from the crankcase down into the fuel tank. This pressure forces the gasoline up through the second line into the carburetor.
Safety Warning for Restorers: Never attempt to convert a pressure tank system to a single-line system without installing a modern vacuum-operated fuel pump. Ensure all rubber seals on your vintage “Cruis-a-Day” tank—particularly the filler cap gasket—are soft and airtight, or the motor will starve of fuel.
Full Gearshift & Simplicity of Operation
Unlike many contemporary outboards that required turning the entire motor 180 degrees to go in reverse, the Super Fastwin featured a robust, forward-neutral-reverse (F-N-R) dog-clutch gearshift. This mechanism, operated via a starboard-side lever, made docking and maneuvering accessible to recreational boaters.
Classic 1950s Industrial Design
In 1954, Evinrude embraced the mid-century modern aesthetic. The 15 HP Super Fastwin featured a gorgeous, stylized cast-aluminum hood shroud painted in Evinrude’s signature deep polychromatic blue, accented with polished aluminum trim and striking red and gold decals. The hood design is “clam-shell” style, secured by two latches, allowing quick, tool-free access to the powerhead for spark plug or pull-start maintenance.
Legacy and Performance
The alternate-firing twin cylinder layout reduces vibration dramatically compared to single-cylinder or simultaneous-firing twin outboards of the past. When properly tuned, a 1954 Super Fastwin is remarkably smooth, capable of trolling quietly for hours while retaining enough power to plane light wooden or aluminum fishing boats of its era.