Mercury 5 MLH Propane 5HP – Four Stroke Propane 20-Inch

Mercury 5HP Propane FourStroke Tiller

The Mercury 5HP Propane (MLH) is an innovative 5HP FourStroke outboard engineered for clean-burning performance and zero-residue operation in the US recreational market. Utilizing a robust 123cc single-cylinder OHV architecture and weighing 59.5 lbs, this engine runs on standard LPG propane, eliminating the need for onboard gasoline storage. This 20-inch long shaft model is configured for manual tiller control, making it the ideal choice for sailboats and eco-sensitive inland lake vessels. Our dependable marine outboard engines deliver the mechanical integrity and environmental benefits of propane propulsion.

Operational peak performance for this Mercury 5HP occurs between 4500 and 5500 RPM. The specialized LPG carbureted induction system guarantees immediate starts and outstanding thermal efficiency without the odor or fuel-degradation issues associated with gasoline. Manufactured in the USA, this highly corrosion-resistant motor features a 2.15:1 gear ratio to translate the 123cc torque into steady hull planing and reliable auxiliary thrust in choppy coastal estuaries.

Technical Specifications of Mercury 5 MLH Propane

• 123cc single-cylinder OHV design delivers smooth, reliable torque powered by clean-burning LPG propane fuel.
• LPG carburetion eliminates the maintenance struggles of gasoline, such as clogged jets and fuel degradation during storage.
• 20-inch long shaft ensures deep propeller immersion for consistent thrust on high-transom sailboats and utility skiffs.
• Manual 6-position tilt and 360-degree pivot steering allow for precise engine angling and effortless harbor maneuvering.
• Through-propeller exhaust design manages engine backpressure and operating noise for a more peaceful boating experience.
• Manual pull-start mechanism with an integrated decompression system ensures easy, low-effort ignition in all conditions.

Clean-Burning LPG Advantage

Propane is a zero-residue fuel that produces 30% fewer emissions compared to gasoline. For American boaters, this means no more gas odors, no spilled fuel on the deck, and a significantly simpler maintenance schedule, as propane does not gum up carburetors even after months of storage.

Sailboat Auxiliary Match

The 20-inch long shaft and clean fuel system make the 5HP Propane an excellent auxiliary for cruising sailboats. It provides the sustained low-end thrust needed for navigating difficult coastal tidal flows while offering the convenience of utilizing the same propane tanks often used for onboard stoves and heating systems.

Reliable OHV Engineering

The 123cc OHV powerhead is a proven design that prioritizes mid-range torque and thermal stability. This translates to exceptional durability and incredibly smooth power delivery during harbor transits, providing the reliable performance that recreational anglers and sailors depend on daily in the American maritime environment.

Mercury Factory Warranty

Mercury Marine protects this 5HP Propane outboard with a comprehensive 3-Year Limited Warranty for US owners. This factory-backed coverage covers structural and mechanical defects to ensure long-term maritime reliability, reflecting a commitment to sustainable and innovative marine power.

Maintenance & Longevity

Maintaining clean oil in the 0.45L wet sump lubrication system is vital for preserving engine tolerances. Always flush the cooling system with fresh water after every saltwater outing. Pro Tip from the Shop: Always use a high-quality propane regulator and check the fuel hose for any signs of cracking; because propane burns drier than gasoline, ensure you are using the correct spark plug gap to maintain a strong ignition and perfectly smooth idle.