Johnson 25HP Long Tiller – 2S (M15060)

Johnson 25HP Long Tiller – 2-Stroke outboard motor is a dependable and powerful engine, ideal for small to medium-sized boats. Renowned for its lightweight design and responsive performance, it’s a favorite for fishing, utility, and recreational use. Below is a detailed description:

General Information

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

Key Features

• Lightweight and Portable Design: Weighing approximately 110–125 pounds, making it easy to install and transport.
• Tiller Handle Control: Offers straightforward steering with integrated throttle and gear shift.
• Manual Start (Optional Electric Start): Reliable pull-start system, with electric start available on some models.
• Shallow Water Drive: Designed to operate efficiently in rivers, creeks, or shallow bays.
• Durable Build: Corrosion-resistant materials ensure durability for freshwater and saltwater applications.

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 gallons in capacity.

Performance and Applications

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

Applications:

• Fishing boats
• Utility boats
• Inflatable dinghies

Maintenance Tips

 Fuel System Maintenance

• Inspect fuel lines, connectors, and primer bulb for wear or leaks.
• Replace the inline fuel filter annually.
• Use a fuel stabilizer to prevent carburetor issues during storage.

Spark Plug Replacement

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

 Water Pump Impeller Maintenance

• Replace the impeller every 2–3 years or if you notice reduced water flow.
• Flush the cooling system with fresh water after each saltwater use to prevent corrosion.

4. Gearcase Oil Change

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

5. Carburetor Cleaning

• Clean the carburetor if the engine idles roughly, has difficulty starting, or loses power. Use a rebuild kit if necessary.

Common Issues and Troubleshooting

Starting Problems

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

Overheating

• Cause: Worn impeller or debris in the water intake.
• Solution: Replace the impeller and clean the intake screens.

Loss of Power

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

Parts and Accessories

OEM Parts

• Johnson/Evinrude Dealers: Genuine parts are available from authorized Johnson/Evinrude service centers.
• Online Retailers:
  • MarineEngine.com
  • Boats.net
  • barosemarineoutboats.uk

Aftermarket Parts

• Sierra Marine: Offers reliable aftermarket components, including filters and impellers.
• Mallory Marine: Known for high-quality carburetor and ignition components.

Used Parts

• eBay: Look for “Johnson 25HP 2-stroke parts” for used or refurbished options.
• Marine Salvage Yards: Affordable sources for hard-to-find parts.

Performance Enhancements

Propeller Upgrade:

• Aluminum props are standard; upgrading to stainless steel can enhance durability and performance.
• Select the correct pitch based on your boat size and intended use.

Fuel Efficiency Tips:

• Use ethanol-free gasoline to minimize carburetor issues.
• Add a fuel stabilizer like Sta-Bil to keep fuel fresh during storage.

Engine Tune-Up:

• Regularly decarbonize the engine to maintain performance and extend its lifespan. Johnson 25HP Long Tiller – 2S (M15060)