1969 Johnson 6 HP Sea-Horse Outboard Specs & Part Numbers
Introduction to the 1969 Johnson 6 HP Sea-Horse
The 1969 Johnson 6 HP Sea-Horse (Models CD-26 and CDL-26) represents the pinnacle of golden-era outboard engineering by the Outboard Marine Corporation (OMC). Renowned for its lightweight design, bulletproof reliability, and smooth twin-cylinder operation, this motor remains a favorite among vintage outboard collectors, anglers, and small-boat enthusiasts today. Whether you are restoring one of these classics or keeping a family heirloom running, this technical guide provides the essential specifications, maintenance data, and historical context needed to keep this legendary outboard humming.
Overview & Specifications
In 1969, Johnson redesigned the cowl of the 6 HP line, moving away from the taller, rounded look of the early 1960s to a sleeker, low-profile, angular shroud. Internally, the powerhead retained the robust design that OMC was famous for, featuring a cross-flow scavenged two-stroke twin powerhead.
| Parameter | Specification / Value |
|---|---|
| Model Numbers | CD-26 (Short Shaft / 15″), CDL-26 (Long Shaft / 20″) |
| Horsepower | 6 HP @ 4,500 RPM |
| Engine Type | 2-Cylinder, 2-Stroke, Inline |
| Displacement | 8.84 cubic inches (144.8 cc) |
| Bore x Stroke | 1.9375″ x 1.500″ (49.2 mm x 38.1 mm) |
| Fuel/Oil Ratio | 50:1 (Unleaded Regular Gas to TC-W3 2-Stroke Outboard Oil) |
| Fuel Tank Capacity | External 2-line or converted single-line tank (typically 4 or 6 gallons) |
| Dry Weight | 51 lbs (23.1 kg) |
| Starter Type | Manual Recoil (Pull Start) |
Common Maintenance & Tune-Up Specs
To keep the 1969 Sea-Horse starting on the first pull, regular maintenance of the ignition and fuel systems is paramount. These motors utilize the classic OMC Universal Magneto system, which is highly reliable but requires periodic point-gapping and cleaning.
Ignition System
- Recommended Spark Plug: Champion J6C (historically J6J)
- Spark Plug Gap: 0.030 inches (0.76 mm)
- Breaker Point Gap: 0.020 inches (0.51 mm)
- Armature Plate Timing: Set points to break precisely when the flywheel timing marks align with the pointer on the armature plate.
- Condenser Capacity: 0.18 to 0.22 Microfarads
Fuel & Carburetor Calibration
- Carburetor Type: Float-feed with adjustable low-speed needle and fixed high-speed jet.
- Initial Low-Speed Needle Setting: Gently seat the needle valve clockwise until it stops, then back it out 1.5 turns counter-clockwise. Fine-tune in the water with the engine warmed up and running in forward gear.
- High-Speed Jet: Fixed orifice (No. 41 or No. 42 depending on elevation; standard is typically #41). Requires no adjustment.
Lower Unit & Cooling System
- Impeller Part Number: OMC 379766 (Sierra 18-3001)
- Gearcase Lubricant: OMC Premium Blend (or high-quality Marine 80W-90 Gear Lube)
- Gearcase Capacity: Approx. 9.5 oz (Fill from the bottom drain hole until fluid exits the top vent hole).
Notable Features & History
The 50:1 Fuel Mix Breakthrough
Prior to 1964, most small OMC outboards required a heavy 24:1 gas-to-oil mix. Thanks to advancements in bearing designs (moving toward needle/roller bearings on the connecting rods and crankshaft) and the introduction of improved TC-W oils, by 1969, Johnson officially rated this 6 HP motor for a much cleaner-burning 50:1 mix. This drastically reduced spark plug fouling and exhaust smoke.
Key Historical and Engineering Highlights:
- The Low-Profile Cowl: The 1969 model year featured the iconic “low-profile” latch-on fiberglass cowl shroud. It featured a front-mounted carrying handle and an updated styling package that made the motor look much more modern than its early-60s predecessors.
- Full Gearshift Capability: Unlike smaller 2 HP or 3 HP outboards of the era that required pivoting the entire engine 180 degrees to reverse, the 6 HP Sea-Horse featured a dedicated front-mounted gear shift lever with Full 3-Way action: Forward, Neutral, and Reverse (F-N-R).
- Thermostatically Controlled Cooling: Even at 6 horsepower, this outboard included a bypass thermostat. This design ensured the motor quickly reached its ideal operating temperature, improving fuel atomization and preventing cylinder head carbon buildup during cold-water idling.
- Vibration Mitigation: Known for its exceptionally smooth idle, the CD-26 utilizes a full-rubber suspension mount housing system. The powerhead is isolated from the steering bracket by rubber mounts, significantly reducing tiller arm vibration during long trolling sessions.
Pro-Tips for Modern Operators
- Avoid Ethanol Fuel: The internal fuel lines, fuel pump diaphragm, and carburetor float needle on these vintage motors were not designed to withstand modern ethanol. Always run 91+ Octane Recreational Fuel (Ethanol-free) to prevent rubber degradation and carburetor clogging.
- Keep an Eye on the Coils: The original OMC coils under the flywheel from this era were notorious for cracking over time due to thermal expansion. If you experience a loss of spark after the engine warms up, pull the flywheel and inspect the green coils. If they are cracked or showing exposed copper windings, replace them with modern epoxy-coated replacement coils.
- Pee-Hole Check: The 1969 Johnson 6 HP does not have a traditional “tell-tale” stream. Instead, it misty-sprays water out of the exhaust relief holes on the back of the midsection column. If you do not see a mist and water droplets spitting from these holes within 30 seconds of starting, shut the motor off immediately and inspect the water pump impeller.