Mariner 20HP Short Tiller – 2S (M17088)

Mariner 20HP Short Tiller – 2-Stroke (M17088) outboard motor is a compact, reliable, and efficient engine, perfect for small to medium-sized boats. Designed with performance and ease of use in mind, this 2-stroke engine is ideal for fishing boats, dinghies, and smaller recreational crafts. Below is a detailed description of this motor:

 Information

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

Key Features

• Lightweight Design: Weighs approximately 90–100 pounds, making it easy to handle, transport, and install on various boat types.
• Tiller Handle Control: The tiller handle provides easy and direct control over the motor with integrated throttle and gearshift.
• Manual Start: Features a reliable pull-start system, ensuring dependable starting even in adverse conditions.
• Corrosion-Resistant: Built to endure the challenges of both saltwater and freshwater environments, ensuring long-term durability.
• Shallow Water Capability: Ideal for use in shallow waters, making it perfect for fishing in rivers, lakes, or bays.

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: Typically equipped with an external fuel tank, ranging from 6 gallons or more.

Performance and Applications

• Speed Potential: Can achieve speeds of up to 20–25 mph, depending on the boat size, load, and water conditions.

Applications:

• Fishing boats
• Small utility boats
• Inflatable boats
• Tenders and dinghies

Maintenance Tips

 Fuel System Maintenance

• Regularly inspect fuel lines, primer bulb, and connections for any wear, cracks, or leaks.
• Replace the fuel filter annually, or when fuel flow seems restricted.
• Use a fuel stabilizer such as Sta-Bil when storing the motor for extended periods to prevent carburetor clogging.

Spark Plug Maintenance

• Recommended Spark Plug: Champion QL77JC4 or equivalent.
• Check and replace spark plugs every 100 hours of use or annually, whichever comes first. Be sure to adjust the gap to 0.030 inches for optimal performance.

 Water Pump Impeller

• Inspect the water pump impeller every 2–3 years or sooner if you notice reduced water flow.
• After use in saltwater, flush the cooling system with fresh water to prevent internal corrosion.

 Gearcase Oil Change

• Change the gearcase oil annually or after 100 hours of use. Look for signs of water contamination in the oil (milky appearance) and replace seals if necessary.

 Carburetor Cleaning

• Clean the carburetor if the motor idles roughly or experiences power loss. If needed, rebuild the carburetor using an OEM kit for optimal fuel delivery.

Common Issues and Troubleshooting

Starting Problems

• Cause: Stale fuel, clogged carburetor, or worn spark plugs.
• Solution: Replace old fuel, clean or rebuild the carburetor, and check the spark plugs.

Overheating

• Cause: A worn or damaged water pump impeller, or debris in the water intake.
• Solution: Replace the impeller and clear any debris from the cooling system.

Loss of Power

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

Parts and Accessories

OEM Parts

• Mariner Dealers: Genuine parts can be sourced from authorized Mariner service centers.
• Online Retailers:
  • Boats.net
  • MarineEngine.com

Aftermarket Parts

• Sierra Marine: Offers aftermarket components like impellers, ignition systems, fuel filters, and more.
• Mallory Marine: Known for aftermarket parts including spark plugs, carburetor kits, and more.

Used Parts

• eBay: Search for “Mariner 20HP 2-stroke parts” for used or refurbished components.
• Marine Salvage Yards: These are good sources for affordable, used parts for older outboard motors.

Performance Enhancements

Propeller Upgrade:

• Stainless steel props are more durable than aluminum, improving both performance and longevity.
• Choosing the right propeller pitch for your boat can enhance fuel efficiency and top-end speed.

Fuel Efficiency Tips:

• Use ethanol-free gasoline to avoid carburetor issues.
• Add fuel stabilizer when storing the motor for long periods.

Engine Tune-Up:

• Periodically decarbonize the engine to prevent carbon buildup, which can impact engine performance and fuel efficiency. Mariner 20HP Short Tiller – 2S (M17088)