Evinrude 20HP Long Tiller – 2S (M16906)

Evinrude 20HP Long Tiller – 2-Stroke (M16906) outboard motor is a compact, high-performance engine designed for small to medium-sized boats. Known for its reliability, ease of use, and durability, this 2-stroke motor is ideal for both recreational boating and fishing applications. Below is a detailed description of this model:

General Information

• Brand: Evinrude
• Horsepower: 20 HP
• Engine Type: 2-Stroke
• Control Type: Tiller Handle
• Shaft Length: Long (20 inches)
• Fuel Delivery: Carbureted

Key Features

• Lightweight and Portable: Weighs approximately 90–100 pounds, offering a balance of power and portability for easy handling and transport.
• Tiller Handle Control: The integrated tiller handle makes for simple steering, with built-in throttle and gearshift for easy operation.
• Manual Start (Optional Electric Start): Reliable pull-start system, with some models offering the option for electric start.
• Shallow Water Drive: Perfect for shallow water applications such as fishing in rivers, lakes, or coastal bays.
• Durable and Corrosion-Resistant: Built to endure freshwater and saltwater conditions, featuring rust-resistant components to ensure longevity.

Fuel and Oil

• Fuel Type: Unleaded gasoline (minimum 87 octane).
• Oil Mix Ratio: 50:1 gasoline-to-oil ratio (use TC-W3 certified 2-stroke marine oil).
• Fuel Tank: External fuel tank, typically 6–12 gallons in capacity.

Performance and Applications

• Speed Potential: Capable of achieving speeds of 20–25 mph, depending on boat size and load.

Applications:

• Fishing boats
• Small utility boats
• Dinghies or inflatable boats
• Tenders and smaller crafts

Maintenance Tips

Fuel System Maintenance

• Inspect fuel lines, primer bulbs, and connections regularly for wear or leaks.
• Replace the fuel filter at least once a year or as needed.
• Use a fuel stabilizer during off-season storage to prevent carburetor issues.

 Spark Plug Replacement

• Recommended Spark Plug: Champion QL77JC4 or equivalent.
• Replace spark plugs annually or after 100 hours of use. Be sure to check and set the gap to 0.030 inches.

Water Pump Impeller Maintenance

• Replace the water pump impeller every 2–3 years, or sooner if you notice reduced water flow.
• After use in saltwater, flush the cooling system with fresh water to avoid corrosion.

 Gearcase Oil Change

• Change the lower unit oil annually. Check for signs of water intrusion (milky oil) and replace seals if necessary.

 Carburetor Cleaning

• Clean the carburetor if the engine idles poorly or loses power. Use a carburetor cleaner or a rebuild kit if needed.

Common Issues and Troubleshooting

Starting Issues

• Cause: Stale fuel, clogged carburetor, or weak spark.
• Solution: Replace old fuel, clean or rebuild the carburetor, and inspect spark plugs and ignition system.

Overheating

• Cause: Worn or damaged impeller or debris in the cooling water intake.
• Solution: Replace the impeller and clean the water intake screen to restore cooling performance.

Loss of Power

• Cause: Fouled spark plugs, a dirty carburetor, or a damaged propeller.
• Solution: Replace spark plugs, clean the carburetor, and inspect the propeller for any issues.

Parts and Accessories

OEM Parts

• Evinrude Dealers: Genuine parts are available at authorized Evinrude service centers.
• Online Retailers:
  • Boats.net
  • MarineEngine.com

Aftermarket Parts

• Sierra Marine: Provides high-quality aftermarket parts, including impellers, ignition components, and filters.
• Mallory Marine: Offers carburetor kits, spark plugs, and other performance parts for Evinrude motors.

Used Parts

• eBay: Search for “Evinrude 20HP 2-stroke parts” to find used or refurbished components.
• Marine Salvage Yards: Affordable sources for hard-to-find or discontinued parts.

Performance Enhancements

Propeller Upgrade:

• Aluminum propellers are standard, but upgrading to stainless steel can improve durability and enhance performance.
• Select the appropriate prop pitch to match your boat’s load and intended use.

Fuel Efficiency Tips:

• Use ethanol-free gasoline to minimize carburetor issues and ensure cleaner combustion.

Add a fuel stabilizer like Sta-Bil to keep fuel fresh during storage.

Engine Tune-Up:

• Periodically decarbonize the engine to maintain optimal performance and prevent carbon buildup, which can affect fuel efficiency. Evinrude 20HP Long Tiller – 2S (M16906)