Yamaha 25HP Short Tiller – 2S (M16406)
Yamaha 25HP Short Tiller – 2-Stroke outboard motor is a compact, lightweight, and high-performing engine, ideal for a wide range of boating activities. Designed for reliability, ease of operation, and durability, it’s a popular choice for anglers, recreational boaters, and utility craft users. Below is a detailed description:
General Information
- Brand: Yamaha
- Horsepower: 25 HP
- Engine Type: 2-Stroke
- Control Type: Tiller Handle
- Shaft Length: Short (15 inches)
- Fuel Delivery: Carbureted
Key Features
- Lightweight and Portable Design: Weighing around 105–115 pounds, making it easy to transport and install.
- Tiller Handle Control: Simple, direct steering with an integrated throttle and gear shift for precise control.
- Manual Start (Optional Electric Start): Reliable pull-start system ensures dependable operation, with optional electric start on some models.
- Shallow Water Drive Capability: Perfect for navigating rivers, creeks, and other shallow areas.
- Yamaha Build Quality: Corrosion-resistant materials make it suitable for freshwater and saltwater use.
Fuel and Oil
- Fuel Type: Unleaded gasoline (minimum 87 octane).
- Oil Mix Ratio: 50:1 gasoline-to-oil ratio (use Yamaha TC-W3 certified 2-stroke marine oil).
- Fuel Tank: External fuel tank, typically 6 gallons in capacity.
Performance and Applications
- Speed Potential: Capable of propelling small to medium-sized boats at speeds of 20–30 mph, depending on the load.
Applications:
- Fishing boats
- Small utility boats
- Inflatable boats and tenders
Maintenance Tips
Fuel System Maintenance
- Inspect the fuel lines, connectors, and primer bulb for signs of wear or leaks.
- Clean or replace the fuel filter annually.
- Use a fuel stabilizer to prevent carburetor clogging during off-season storage.
Spark Plug Replacement
- Recommended Spark Plug: NGK BR7HS 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 sooner if water flow decreases.
- Flush the cooling system with freshwater after use in saltwater to prevent corrosion.
Gearcase Oil Change
- Change the lower unit oil annually. Inspect for water intrusion (milky oil), and replace seals if necessary.
Carburetor Cleaning
- Clean the carburetor if the engine idles roughly or loses power. Use Yamaha’s carb cleaner or a rebuild kit as needed.
Common Issues and Troubleshooting
Starting Problems
- Cause: Stale fuel, clogged carburetor, or weak spark.
- Solution: Replace old fuel, clean or rebuild the carburetor, and replace spark plugs.
Overheating
- Cause: Worn or damaged impeller, or debris in the water intake.
- Solution: Replace the impeller and clean the cooling water intake.
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
- Yamaha Dealers: Genuine Yamaha parts are available at authorized service centers or online.
- Online Retailers:
Aftermarket Parts
- Sierra Marine: Trusted for reliable aftermarket parts, including impellers and filters.
- Mallory Marine: Offers high-quality components for carburetor and ignition systems.
Used Parts
- eBay: Search for “Yamaha 25HP 2-stroke parts” for used or reconditioned components.
- Marine Salvage Yards: A cost-effective option for hard-to-find parts.
Performance Enhancements
Propeller Upgrade:
- Upgrade from aluminum to stainless steel for increased durability and performance.
- Choose a pitch that matches your boat’s size, weight, and intended use.
Fuel Efficiency Tips:
- Use ethanol-free gasoline to prevent carburetor issues.
- Add a fuel stabilizer like Sta-Bil to keep fuel fresh during storage.
Engine Tune-Up:
- Regularly decarbonize the engine to maintain optimal performance and extend its life.
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