Mercury 5MH 5HP Outboard – 15in Shaft
Steering stays direct, Mercury 5MH pushes 5 horsepower. A 15-inch shaft fits standard transoms. The layout favors easy servicing over a season of use. A fit for dinghies, jon boats, and small tenders.
- 5 horsepower, ready to run
- Shaft length 15 inches
- Backed by standard marine warranty
- Rated at 5 horsepower
- Light enough for easy mounting
Description
Deploy the eco-friendly, propane-powered Mercury 5MH to bypass volatile gasoline storage hazards on small sailboats. The pressurized 123cc LPG induction system forces steady torque, pushing heavily loaded inflatable tenders across choppy marina basins safely. Measuring your mounting bracket verifies this 15 inch short shaft portable outboard operates smoothly without excessive gearcase drag.
Eliminate frustrating carburetor gumming during seasonal storage by utilizing the carbon-free propane combustion system as a permanent mechanical fix. You simply thread a standard LPG hose to the cowl connector for instant fuel delivery. Mercury casts the 27.2 kg block using corrosion-resistant aluminum alloys. This material barrier stops rapid metal pitting when leaving the kicker motor clamped to saltwater transoms.
Key Features of Mercury 5MH
- Pressurized Propane Induction: Eliminates ethanol-related carburetor gumming completely, guaranteeing reliable starting even after months of seasonal storage.
- 15-Inch Standard Shaft: Matches low dinghy transoms perfectly, preventing lower unit drag and maximizing fuel efficiency on light hulls.
- Six-Position Manual Tilt: Adjusts the running angle physically, allowing the operator to lift the gearcase over shallow coastal reefs safely.
- 360-Degree Tiller Steering: Allows the operator to spin the engine completely around, providing full reverse thrust instantly without complex gearboxes.
- Auto-Decompression System: Bleeds cylinder pressure mechanically during starting, reducing the physical pull rope effort required to ignite the block.
- Corrosion-Resistant Castings: Blocks severe galvanic decay physically, protecting the powerhead block across decades of daily saltwater exposure.
- Through-Prop Exhaust Routing: Forces combustion gases directly underwater, significantly reducing engine noise and raw fumes at the operator seating position.
- Accessible Oil Drain: Simplifies routine crankcase lubrication changes, saving significant time during seasonal maintenance prep without specialized tools.
- Rugged Lower Unit: Transfers single-cylinder horsepower to the propeller securely, maintaining forward momentum on heavily loaded inflatable dinghies.
- Eco-Friendly LPG Combustion: Burns propane with zero carbon buildup, easily meeting the strictest harbor emissions regulations and global marine standards.
Why Choose Mercury 5MH
You purchase this 15-inch propane block strictly for small tenders or eco-sensitive lakes requiring absolute fuel simplicity. It lacks remote steering and relies entirely on physical tiller operation. Sourcing a propane powered portable outboard motor keeps your tender legally powered.
- Measure your dinghy transom to confirm a 15-inch vertical drop requirement.
- Ensure the operator possesses the physical strength to lift 27.2 kilograms safely.
- Comply with strict harbor emissions laws utilizing clean-burning propane technology.
Ideal Application and Vessel Fitment
This ultra-portable 15-inch propane outboard thrives on small inflatable tenders, square-back canoes, and rigid fiberglass dinghies requiring minimalist eco-friendly power. Because it runs on standard pressurized LPG, operators completely avoid carrying dangerous liquid gasoline onboard small vessels. Rotating the tiller 360 degrees provides complete directional thrust, making this lightweight mercury portable outboard motor an incredibly nimble propulsion choice for navigating crowded anchorages and zero-emission lakes.
Warranty, Support and Maintenance
Authorized recreational operation receives a 3-Year Limited Warranty alongside a 3-Year Corrosion Warranty. Registered commercial applications fall under a strict 1-Year Limited Warranty with zero corrosion coverage applied to the block. Scheduled maintenance requires replacing gearcase lubricants and checking spark plugs at manual-specified intervals. Always save all physical service records. Your engine serial number acts as the only way to source exact genuine replacement parts. Mulmotor can assist with product details and order-related questions before purchase.
Mercury 5HP 5MH LPG Propane Specs
| Brand | Mercury Marine |
| Model Series | FourStroke Propane |
| Engine Type | 1-Cylinder / 2-Valve / 4-Stroke |
| Displacement | 0.12 Liters (123 cc) |
| Horsepower | 5 HP @ 5000 RPM |
| Fuel Induction | Pressurized Propane (LPG) |
| Exhaust System | Through Propeller |
| Shaft Length | 15" (Short) |
| Dry Weight | 27.2 kg (60 lbs) |
| Starting System | Manual (w/ Automatic Decompression) |
| Trim/Tilt Method | Manual (6-position) |
| Standard Warranty | 3-Year Limited |
| Application | Eco-friendly, low-maintenance power; no gasoline storage or carburetor gumming issues. |













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