Mercury 25MLH 25HP 20in Four Stroke Manual Start Tiller Outboard Motor

Description

Featuring a 20-inch shaft length, the Mercury 25MLH Manual Tiller Outboard Motor provides dependable manual-starting propulsion for long-transom commercial skiffs. The 500 cc three-cylinder four-stroke engine produces 25 brake horsepower at 5800 RPM. Overhead camshaft fuel injection burns 2.1 gallons per hour at full continuous rating, providing exceptional operating range across coastal marshes.

Low-copper aluminum alloy protects the engine block and cylinder head against severe saltwater corrosion. Induction-hardened cast iron sleeves resist high-hour piston ring wear. Internal water passages feature zinc pencil anodes. Package dry weight measures 132 lbs. The crankcase holds 1.9 quarts of oil, accepting standard 5/16-inch marine fuel line hoses.

Key Features of Mercury 25MLH

Commercial skiff captains buy Mercury 25MLH inboard engine alternatives to obtain lightweight long-shaft tiller power for transport skiffs and work tenders. The manual recoil starter pairs with battery-free electronic fuel injection to ensure starting independence in remote bays.

• Battery-free electronic fuel injection requires no onboard battery to deliver instant turnkey starts
• Manual recoil starting systems provide complete operational independence in remote wilderness waters
• Multifunction tiller handles combine shift, throttle, steering friction, and stop button in one ergonomic grip
• Long 20-inch shaft length keeps water pump intakes submerged beneath turbulent hull wakes
• Mercury 25MLH horizontal tiller angle adjustments allow customized operation from port or starboard seating positions
• Low overall engine weight of 132 pounds allows simple manual transport between vehicle beds and boat transoms
• Freshwater washdown connections allow quick garden hose flushing without starting the motor
• Heavy-duty rubber cowl seals keep saltwater spray away from sensitive electrical components

Torque Dynamics Combustion Limits

Computerized fuel injection maps deliver 24.5 lb-ft of continuous torque at 3500 RPM, giving utility skiffs immediate bite in heavy chop. Dual wax thermostats regulate cooling water loops between 140°F and 160°F. Seawater cooling circuits discharge exhaust heat through the propeller hub, maintaining a lean 265 g/kWh fuel efficiency rate.

Transom Alignment Stringer Clearance

The 20-inch clamp bracket fastens straight onto standard 20-inch boat transoms meeting ABYC P-1 standards. Clearances demand 14 inches of splash well width to accommodate full steering articulation. Heavy manual clamp screws lock the motor securely to the transom board.

Operating Protocol Negative Boundary

Tiller twist grips provide positive throttle modulation and crisp gear selection when approaching docks. Cooling water tell-tale streams require visual confirmation upon starting. This manual tiller outboard is not engineered for high-speed lightweight race craft, dry running, or operation exceeding 5800 RPM.

• Verify raw water tell-tale stream discharge each shift
• Drain fuel water separator collection bowls every 50 hours
• Replace lower gearcase hypoid lubricant every 100 operating hours

Factory Warranty Delivery Manifest

Recreational customers receive a 3-Year factory warranty covering base engine and gearcase components. The heavy shipping crate holds the 20-inch manual tiller outboard motor, external 6.6-gallon fuel tank with primer line, spare pull rope, and complete technical owner manual.