1994 Evinrude 25HP Long Tiller – 2S (M7912)

1994 Evinrude 25HP Long Tiller – 2-Stroke outboard motor is a classic, lightweight, and powerful engine, perfect for small to mid-sized boats. Known for its robust performance and ease of maintenance, this model is a favorite for fishing, utility boats, and recreational use. Below is a detailed overview:

General Information

• Brand: Evinrude
• Horsepower: 25 HP
• Engine Type: 2-Stroke
• Control Type: Tiller Handle
• Shaft Length: Long (20 inches)
• Fuel Delivery: Carbureted

Key Features

1. 2-Stroke Power: Provides excellent power-to-weight ratio and rapid acceleration.
2. Lightweight Design: Easier to transport and mount, weighing approximately 105–115 pounds.
3. Tiller Handle Control: Simple and direct steering with an integrated throttle.
4. Manual Start (Electric Start Optional): Reliable pull-start system, with electric start available on some models.
5. Shallow Water Capability: Ideal for shallow rivers, lakes, and tight spots.
6. Durable Construction: Designed for freshwater and saltwater use with corrosion-resistant coatings.

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).
• Tank Capacity: External fuel tank (usually 6 gallons).

Performance and Applications

Speed Potential: Capable of reaching 20–30 mph depending on the boat size and load.

Applications:

• Small fishing boats
• Utility boats
• Tenders or backup motors for larger vessels

Maintenance Tips

1. Fuel System Maintenance

• Regularly inspect the fuel tank, lines, and connections for wear or leaks.
• Clean or replace the fuel filter as needed.
• Use a fuel stabilizer to prevent varnish buildup in the carburetor.

2. Spark Plug Replacement

• Recommended spark plug: Champion QL77JC4 or equivalent.
• Replace every season or after 100 hours of use. Ensure the gap is set to 0.030 inches.

3. Water Pump Impeller Replacement

• Replace every 2–3 years or if you notice reduced water flow or overheating.
• Inspect the cooling system for debris or clogs in the intake screens.

4. Gearcase Oil

• Change lower unit oil annually.
• Check for water intrusion (milky oil) and replace seals if needed.

5. Carburetor Cleaning

• Clean the carburetor if the engine idles roughly or loses power.
• Rebuild kits are readily available for this model.

Common Issues and Troubleshooting

Starting Problems

• Cause: Clogged carburetor, old fuel, or weak spark.

Solution:

• Clean or rebuild the carburetor.
• Replace old fuel and inspect spark plugs.

Overheating

• Cause: Worn or damaged impeller.
• Solution: Replace the impeller and flush the cooling system.

Loss of Power

• Cause: Fouled spark plugs, dirty carburetor, or damaged propeller.
• Solution:
  • Replace spark plugs and clean the carburetor.
  • Inspect and replace the propeller if needed.

Parts and Accessories

OEM Parts

• Evinrude Dealers: Genuine parts are available from authorized Evinrude dealers.
• Online Retailers:
  • Boats.net
  • MarineEngine.com
  • barosemarineoutboats.uk

Aftermarket Parts

• Sierra Marine: Offers reliable aftermarket replacement parts like impellers and spark plugs.
• Mallory Marine: Known for ignition and fuel system components.

Used Parts

• eBay: Search for “1994 Evinrude 25HP parts” for used or reconditioned parts.
• Marine Salvage Yards: Check for rare or discontinued components.

Performance Enhancements

Propeller Upgrades

• Select the right pitch to match your boat’s load and speed requirements.
• Use a stainless steel propeller for enhanced durability and performance.

Fuel Efficiency

• Use ethanol-free gasoline to reduce carburetor issues.
• Add a fuel stabilizer like

Sta-Bil during storage.

1. Regular Tune-Ups
   • Keep the engine tuned to prevent carbon buildup and maintain optimal performance.

specific maintenance

maintenance tasks, parts sourcing, or upgrade recommendations for your 1994 Evinrude 25HP Long Tiller – 2-Stroke

Options:

Step-by-Step Maintenance Tasks

• Changing the water pump impeller
• Carburetor cleaning or rebuilding
• Spark plug replacement
• Gearcase oil change

Parts Sourcing Assistance

• Finding OEM or aftermarket parts with part numbers and sources
• Used or reconditioned parts availability

Performance Upgrades

• Propeller selection and sizing
• Tips for optimizing fuel efficiency and power

Troubleshooting Specific Issues

• Starting problems
• Overheating issues
• Loss of power or rough idling