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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