Mariner 25HP Short Tiller -2S

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Mariner 25HP Short Tiller – 2S (M16850)

Mariner 25HP Short Tiller – 2-Stroke (M16850) is a lightweight, powerful, and versatile outboard motor designed for small to medium-sized boats. Its 2-stroke design offers simplicity, reliability, and strong performance, making it ideal for fishing, utility, and recreational use. Below is a detailed overview of this model:

 Information

  • Brand: Mariner
  • Horsepower: 25 HP
  • Engine Type: 2-Stroke
  • Control Type: Tiller Handle
  • Shaft Length: Short (15 inches)
  • Fuel Delivery: Carbureted

Key Features

  • Compact and Lightweight Design: Easy to transport and install, ideal for smaller boats.
  • Responsive Throttle: The 2-stroke design provides quick acceleration and high top-end speeds.
  • Tiller Handle Control: Integrated throttle and gear shift on the tiller handle for convenient operation.
  • Proven Durability: Built with materials and coatings to resist corrosion, suitable for freshwater and saltwater environments.
  • Ease of Maintenance: Simple 2-stroke design makes servicing and repairs straightforward.

Fuel and Oil

  • Fuel Type: Pre-mixed unleaded gasoline (minimum 87 octane) with 2-stroke oil.
  • Fuel/Oil Mixture Ratio: Typically 50:1 (consult your owner’s manual for precise specifications).
  • Fuel Tank: Typically comes with a 6-gallon external tank.

Performance and Applications

  • Top Speed: Can achieve speeds of 20–25 mph, depending on boat size and load.

Applications:

  • Fishing boats
  • Jon boats
  • Tenders
  • Utility boats
  • Inflatable boats

Maintenance Tips

 Fuel System Maintenance

  • Use fresh fuel mixed with a high-quality 2-stroke oil.
  • Replace the inline fuel filter annually to prevent clogging.
  • Inspect fuel lines and primer bulbs regularly for wear or leaks.

Spark Plug Maintenance

  • Recommended Spark Plug: NGK BUZ8H or equivalent.
  • Inspect and clean spark plugs regularly, replacing them annually or every 100 hours.
  • Ensure the spark plug gap is set correctly (typically 0.030 inches).

 Cooling System Care

  • Flush the motor with fresh water after every saltwater use to prevent corrosion.
  • Replace the water pump impeller every 2–3 years or if water flow decreases.

Lower Unit Maintenance

  • Check and replace gear oil annually or after 100 hours of operation.
  • Inspect the propeller for damage and ensure the propeller shaft is free of fishing line or debris.

 Decarbonization

  • Perform a decarbonization process every season or 50 hours of operation to remove carbon deposits.

Common Issues and Troubleshooting

Hard Starting

  • Cause: Stale fuel, improper fuel/oil mixture, or fouled spark plugs.
  • Solution: Use fresh fuel, verify the correct fuel/oil ratio, and clean or replace spark plugs.

Overheating

  • Cause: Clogged cooling water intake or worn impeller.
  • Solution: Clear the intake screen and replace the water pump impeller as needed.

Loss of Power

  • Cause: Fouled spark plugs, dirty carburetor, or damaged propeller.
  • Solution: Clean or replace spark plugs, service the carburetor, and inspect the propeller for damage.

Parts and Accessories

OEM Parts

  • Mercury/Mariner Dealers: Genuine parts are available from authorized Mercury and Mariner dealers.
  • Online Retailers:

Aftermarket Parts

  • Sierra Marine: Provides aftermarket parts like fuel filters, water pump kits, and spark plugs.
  • NGK Spark Plugs: High-quality replacement spark plugs compatible with Mariner outboards.

Used Parts

  • eBay: Look for used or refurbished parts under “Mariner 25HP 2-stroke parts.”
  • Marine Salvage Yards: Check for affordable parts for older motors.

Performance Enhancements

Propeller Upgrade:

  • Upgrade to a stainless steel or higher-performance propeller to improve durability and speed.
  • Adjust pitch based on your specific boating requirements (e.g., higher pitch for speed, lower pitch for pulling power).

Fuel Optimization:

  • Use ethanol-free gasoline to prevent carburetor issues.
  • Add a fuel stabilizer during off-season storage.

Periodic Maintenance:

  • Keep the carburetor clean and decarbonize the engine regularly to maintain peak performance. Mariner 25HP Short Tiller -2S (M16850)

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