The Mercury Mariner 2-horsepower 6A1 outboard's specifications include the number of cylinders, the total size of the cylinder, the bore of the cylinder and length of the piston stroke, the engine's total weight, both with fuel and without, and its type of lubrication and ignition system, starting system and cooling system.
A Single Cylinder
The 2-horsepower 6A1 is a one-cylinder outboard. The single cylinder contains 4.5 cubic inches, or 74.5cc. The cylinder bore is 1.85 inches and the length of the piston stroke is 1.69 inches. The advantage of the 2-horsepower 6A1 is its simplicity; that is, it lacks many of complications found in larger motors, like thermostats that need replacing, or a self starter. The single-cylinder powerhead is still in use; a later variant, produced after 2005, produced 2.5 horsepower from the same 4.5 cubic inches of motor.
The 2-horsepower 6A1 is light, one of the few Mercury motors that can be lifted from a boat by a single person. It weighs just 12.5 Kilogram when its on-board fuel tank is not attached to the powerhead of the motor. With the tank attached and ready to be filled with fuel, the weight increases by a full pound to 129 Kilogram.
Lubrication and Ignition
Premixing the engine lubrication oil with gasoline before use is by far the simplest method. Unfortunately, it's also the messiest. Nothing complicated here, just add the correct amount of oil to a certain volume of fuel in your tank, and the job is done. The ignition is just as simple. Called a "capacitor discharge ignition," the major components of the system are a flywheel, primary and secondary coils, an ignition coil and a spark plug.
Pull the Rope, It Runs and Stays Cool.
The motor has the same manual recoil starting that has seen so many homeowners struggling with their lawnmowers. A recoil starter is specified for the Mercury 2HP 61A, rather than an electric starter, because of the motor's small size. The cooling system for the motor is a pump, located in the propeller shaft housing, surrounding the propeller shaft. The pump operates continuously without a thermostat.
- "Mercury/Mariner/Yamaha Outboard Repair Manual, 2.25 - 225 HP, 1- to 4-Cylinder, 1995-2004"