Evinrude Johnson 20 HP Outboard 1973–1978 Service Repair Manual – PDF Download

🛠️ Evinrude Johnson 20 HP Outboard 1973–1978 Service Repair Manual – PDF Download

🧰 This OEM factory service manual covers comprehensive repair and maintenance procedures for Evinrude and Johnson 20 HP 2-stroke outboards produced between 1973 and 1978. It includes detailed chapters on carburetor tuning, ignition system service, cooling maintenance, and recoil starter repair.

📲 Instant PDF download – fully searchable and printable for use on all devices.

🔍 Model Background

The Evinrude Johnson 20 HP Outboard (1973–1978) was part of Outboard Marine Corporation’s reliable small-engine lineup, serving recreational and utility boaters who needed compact, efficient, and dependable performance. Built with simplicity and durability in mind, this motor became a favorite among anglers and small boat users throughout the 1970s.

It featured a 2-cylinder, 2-stroke engine with a displacement of approximately 377cc. Utilizing loop-charged scavenging and a single carburetor, the 20 HP delivered solid torque and smooth throttle response, making it ideal for light to moderate loads on small fishing boats, tenders, and inflatables.

The 20 HP outboard was typically available in both manual and electric start versions and offered options for short or long shafts to suit different transom heights. With a dry weight around 90–100 lbs, it was light enough to be portable yet powerful enough for regular, dependable use.

Designed for easy maintenance and long service life, these models were known for their rugged construction, minimal electronics, and simple mechanical systems. They were particularly popular in remote or off-grid areas where reliability and field-serviceability were essential.

Today, the 1973–1978 Evinrude Johnson 20 HP outboards are still valued in the vintage boating community for their balance of performance, reliability, and nostalgic appeal.

📄 Manual Details for Evinrude Johnson 20 HP (1973–1978):

• Engine Type: 2-stroke, twin-cylinder
• Fuel System: Carbureted, external fuel tank compatible
• Cooling System: Water-cooled with impeller pump
• Ignition System: Magneto ignition system
• Starting System: Manual recoil start
• Trim & Tilt: Manual tilt system
• Years Covered: 1973–1978
• File Format: PDF (searchable and printable)
• Page Count: 200+ pages

📆 Model Years Covered:

• Evinrude Johnson 20 HP Outboard 1973
• Evinrude Johnson 20 HP Outboard 1974
• Evinrude Johnson 20 HP Outboard 1975
• Evinrude Johnson 20 HP Outboard 1976
• Evinrude Johnson 20 HP Outboard 1977
• Evinrude Johnson 20 HP Outboard 1978

📖 Manual Sections Include:

• Routine Maintenance
• Fuel mix ratio, spark plug gap, idle adjustments
• Fuel & Carburetor System
• Jet sizes, float height, choke settings
• Ignition System
• Magneto testing, points gap, coil resistance checks
• Cooling System
• Impeller replacement, thermostat tests, water passage cleaning
• Powerhead Service
• Piston replacement, gasket servicing, crankshaft seals
• Starter System
• Recoil starter spring and rope replacement
• Electrical Schematics
• Ignition and kill switch wiring diagrams

💾 Format & Compatibility:

• File Type: PDF (Digital Download)
• Searchable & Printable: ✅ Yes
• Compatible with: Windows, macOS, iOS, Android, Linux

🔍 Keywords:

Evinrude 20 HP repair manual, Johnson 20 HP outboard PDF, 2-stroke ignition service, carburetor tuning, starter rope repair, cooling system maintenance

❓ Mini FAQ:

Q: Does this manual include wiring diagrams?
A: Yes – complete schematics for ignition and kill switch are included.

Q: Can I print specific chapters?
A: Absolutely – the PDF is printable by section or full manual.

Q: Is this suitable for both Johnson and Evinrude 20 HP engines?
A: Yes – the manual covers both brands between 1973 and 1978.

🧭 Helpful Resources for Johnson & Evinrude Outboard Owners

• Why Every Evinrude & Johnson Outboard Owner Should Own a Service Manual – Find out how a downloadable repair manual can simplify maintenance and help you troubleshoot common problems on your own.
• Outboard Engine Troubleshooter – Not sure what’s wrong with your Johnson or Evinrude engine? Our free tool lists common issues and DIY fixes across all major brands.

🔧 Browse More Johnson & Evinrude Manuals

Note: While our manuals are designed for DIY use, they do not replace professional mechanical training. If you're unsure about a repair or your engine shows serious issues, we strongly recommend visiting a certified marine mechanic. These guides are best suited for owners with basic to moderate mechanical experience.