All about Subaru engines for walk-behind tractors

The walk-behind tractor has become the technique that helps to make gardening easier and faster. Such an indispensable unit is supplied for sale with different motors. Subaru engines are especially popular.

The company today is a global brand, it has become known not only for its machines, but also for its power units, which it designs independently. The history of this brand began in 1917, when only aircraft were produced under this brand.

After the war, the company's factories began to produce motor scooters, in the design of which there was a 135 cubic meter engine. The name of the brand was invented by one of the first founders, since that time no one dared to change it, since Subaru is a cluster of stars in the constellation Taurus.

The initiative to produce cars came after, when this market began to gain momentum. Even later, factories began to manufacture branded motors, which were used in the design of small equipment used in agriculture.

Subaru engines have a lot of advantages, of which they stand out:

• durability;
• minimum noise level;
• reliability.

If you rely on consumer reviews, then the power units of this manufacturer do not require replacement for a long time.if the user complies with all the operating requirements specified in the instructions. This became possible due to the fact that the company uses cast iron sleeves and rings in the design of motors. The installed crankshaft is forged, and the cooling system has a double cyclone element.

If you believe the consumer, then you rarely have to deal with the repair of a Subaru engine, since it has a high degree of reliability thanks to a special cooling system and a reinforced crankshaft design.

Of the shortcomings, only the need to use gasoline at least 92because the motor is very sensitive to the quality of the fuel. It is very difficult to start the unit in winter, but this is not important, since the walk-behind tractor is rarely used at this time of the year, only as a snow blower.

There are a lot of Subaru engine models on the market, but they are all of two series: EX and DY. They differ structurally and in terms of power. The cost of the unit also depends on these two parameters.

Much depends on the needs of the user. If he wants a powerful, multifunctional walk-behind tractor, then he will have to buy an expensive model that will allow using the equipment as a means of transporting small loads.

The EX series has several horizontal motor optionswhich are distinguished by their unique design. Some individual units show excellent performance while being light in weight and size.

DY series are diesel units with high quality air cooling. Their power can vary from 4.8 to 9.5 liters. with.

Robin-Subaru EX17 and Subaru-Robin EX21D are very popular. In the event of a breakdown, any of them is not difficult to repair. All Subaru models have a well thought-out design.

The first engine can be described as a 4-stroke unit with a camshaft at the top. The maximum power that the motor can demonstrate is 5.7 liters. with. The capacity of the fuel tank is 3.6 liters. Such an engine weighs 15 kilograms.

The Subaru-Robin EX21D is also a 4-stroke unit that is easy to maintain. Maximum power 7 horsepower with a torque of 13.9 Nm. The capacity of the fuel tank is 3.6 liters, however, like most power units for motoblocks.

The starter for the carburetor can be:

• spring;
• electric.

The spring mechanism is easy to install, it starts easily, for which the user only needs to move the lever. Its work is carried out in a semi-automatic way, the main thing is that the engine starts up and catch up with speed.

The electric starter is installed together with the battery, since it will be powered from it.

For stable engine operation, it is necessary to monitor the operation of the carburetor, and for this it is necessary to adjust the mechanism responsible for adjusting the speed. The instability of revolutions is already the first indicator that it is time to make adjustments. As a rule, they do this before starting work on a walk-behind tractor, that is, in early spring, since a failure appears after the equipment is idle in the garage.

You can also adjust the speed yourself if you follow the diagram below.

• At the very beginning, the motor is warmed up.
• Remove the screw that is responsible for adjusting the throttle valve. It is necessary to create a backlash between it and the emphasis.
• The cold-running screw is completely unscrewed.
• The stop screw must touch the stop when it is removed. After that, it is returned half a turn to its previous state.
• You can activate the engine and wait for it to idle for a few minutes.
• At this time, the carburetor should run at minimum speed, while the engine should be running.
• Now, using the idle screw, adjust the number of revolutions, setting the maximum number.
• Correct so that from 1100 to 1350 rotations are performed per minute.
• The last three points are repeated until the motor runs stably.

Any unit is configured in a similar way, including the Mikuni carburetor. After 20 hours of operation, it will be necessary to change the oil. In some cases, you will have to adjust the size of the belt, check the valves, insulator.

In the video below you will see how to repair a Subaru EX21 engine for a walk-behind tractor.