Mariner 20HP Short Tiller – 2S (M16910)

Mariner 20HP Short Tiller – 2-Stroke outboard motor is a lightweight and powerful engine designed for small boats, known for its simplicity, reliability, and high performance. Here are the key details about this model: Mariner 20HP Short Tiller – 2S (M16910)

General Information

• Brand: Mariner (produced by Mercury Marine)
• Horsepower: 20 HP
• Engine Type: 2-Stroke
• Control Type: Tiller Handle
• Shaft Length: Short (15 inches)
• Fuel Delivery: Carbureted

Key Features

1. Lightweight Design: Easier to transport and install, typically weighing around 95–105 pounds.
2. 2-Stroke Power: Delivers a high power-to-weight ratio, making it ideal for small, lightweight boats like inflatables, jon boats, or skiffs.
3. Tiller Handle Steering: Provides direct and precise control with integrated throttle and gear shift.
4. Manual Start: Simple and reliable pull-start mechanism.
5. Shallow Water Drive: Perfect for navigating shallow waters or tight areas.
6. Durable Build: Designed for saltwater and freshwater 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 high-quality 2-stroke marine oil).
• Tank Type: External fuel tank with a quick-connect hose system.

Performance and Applications

• Speed Potential: Capable of pushing small boats to speeds of 20–25 mph, depending on load and conditions.
• Best Uses: Fishing, recreational boating, or as a reliable backup engine.
• Propeller Options: Standard aluminum or upgraded stainless steel props available.

Maintenance Tips

Fuel System

• Regularly inspect and clean the fuel tank, lines, and carburetor to prevent clogs.
• Use a fuel stabilizer if storing for long periods.

Oil and Spark Plugs

• Replace spark plugs (recommendation: NGK BP7HS or equivalent) every season or as needed.
• Use marine-grade 2-stroke oil to avoid carbon buildup.

Cooling System

• Flush with freshwater after saltwater use.
• Replace the water pump impeller every 2–3 years or if overheating occurs.

Gearcase Lubrication

• Change lower unit oil annually.

Troubleshooting Common Issues

Starting Problems

• Likely Cause: Fuel system issues or weak spark.
• Solution: Clean/rebuild the carburetor, replace spark plugs, and inspect ignition coils.

Overheating

• Likely Cause: Impeller failure or debris blocking water intake.
• Solution: Replace the impeller and clean water intake screens.

Loss of Power

• Likely Cause: Dirty carburetor, damaged propeller, or worn spark plugs.
• Solution: Clean/rebuild the carburetor, check the prop for damage, and replace plugs.

Parts and Accessories

OEM Parts

• Mariner Dealers: Visit authorized dealers or Mercury Marine for genuine Mariner parts.
• Online Retailers: Sites like Boats.net or MarineEngine.com carry OEM parts with diagrams for easy identification.

Aftermarket Parts

• Sierra Marine: Known for reliable impellers, gaskets, and filters.
• Mallory Marine: Offers quality ignition and carburetor kits.

Used Parts

• eBay: Search for used or reconditioned parts for “Mariner 20HP 2-stroke.”
• Local Salvage Yards: Marine-specific yards may have older Mariner parts.