This is a diagram of the some of the common components and location of the SX Series of engines. Some items are not listed and others that are listed may be an optional purchase.
Easy to read decals, with cold and warm weather starting instructions.
These specifically designed features are added for customer safety and ease of use.
These specifically designed snow guards are strategically placed to keep snow and ice from vital controls and linkages.
This specially designed recoil housing prevents snow and ice buildup from entering the flywheel and recoil components.
The controls and buttons are large, easy to see and user-friendly.
Drain fuel for storage when not in use with the easy to remove screw. Also, a translucent fuel cock strainer cup for inspection and removal of water and dirt particles that might enter the fuel tank and lines.
Dual ball bearing crankshaft support offers maximum stability under demanding loads.
Cast-iron cylinder liners enhance reliability and extend engine
life.The cast-iron cylinder liner has much better wear characteristics
the softer aluminum that surrounds it, making engine life much longer
than if the piston is in contact with the aluminum cylinder wall.
The crankshaft is made of spheroidal graphite cast iron, and the crank pin is high-frequency induction hardened. The crank sprocket used to drive the chain, as well as the gear used to drive the governor gear, are pressed on the output end of the shaft.
An internally structured main bearing cover offers patent-pending technology by creating a highly rigid engine system.
Overhead Cam (OHC) technology and the Pent-Roof combustion chamber allow the Subaru SX engines to use a higher compression ratio of 9:1. The higher compression ratio increases the power produced for a given size engine. It also improves efficiency and overall performance.
The illustration shows the straight intake port on the right side of the picture. The lower resistance to the flow of the air/fuel mixture improves the power, efficiency and lowers emissions. Overhead Cam (OHC) technology allows the intake and exhaust valves to be positioned for optimum performance.
One of the purposes of the timing chain system is to lubricate the upper portion of the cylinder head. The timing chain is engaged between the sprocket portion of the integrated camshaft in the cylinder head and the crankshaft gear sprocket.
The sprocket teeth in the particular shape they are designed are to enhance the durability and realize low noise level.
The camshaft and the sprocket are made of special sintered alloy and constructed as a single piece. The camshaft is provided with intake and exhaust cam in one cam lobe. The decompression release lever is mounted on the sprocket end side.
Cooling fins are cast into both the inside and the outside of the crankcase to utilize every possible cooling area.
The unique Subaru cooling system extends to the underside of the
mounting base. Air is forced over special cooling fins at the bottom of
the engine for maximum cooling.
Head cooling is critically important to long engine life. The Overhead Cam design allows for 360-degree air flow around both the exhaust and intake valve stem areas.
Air is forced over the large slanted cooling fins on the cylinder for improved cooling performance. This design is patent-pending.
Hardened steel rocker arms with precision tappet adjusters are used for greater durability and reduce service requirements.
Special machining on cylinder head allows the oil seal to be placed
around the valve guide. This seal reduces oil consumption and is
replaceable if necessary for service.
Subaru SX engines use automotive quality collet valve retainers for longer life.
The SX lubrication system begins with a patent-pending oil scoop to project the oil to the chain.
The connecting rod is a specially heat-treated aluminum alloy die-casting. Its large and small ends function as bearings. A splasher built into the connecting rod lubricates by splashing engine oil. The piston is an aluminum alloy casting with grooves for mounting compression and oil rings.
A patent-pending rocker cover design constantly
supplies an optimum amount of oil to the cam
shaft and rocker arm even if the engine is
A patent-pending breather system with a pre-separation
passage prevents oil from spouting even if the engine is inclined.
The ignition system is a transistor controlled magneto with the ignition timing set at 23 degrees before top dead center. The magneto consists of a flywheel and ignition coil. To ensure easy starting, the step advancing ignition timing system is incorporated in the ignition coil. This system enables the engine to have basically two different ignition timings according to the engine speed.
Optimized-capacity rigid muffler and 33 percent fewer moving valve
train parts than OHV designs, reduce mechanical noise levels a full 2
decibels below competitive models.
Even though the SX series of engines bring the latest technology,
performance, and durability to the industrial air cooled engine market,
there are no special tools required to work on them. Most
shop tools that small engine mechanics currently own will also
work on these engines for service or complete tear down. Subaru engineers achieved their commitment to 'keep it simple', while utilizing the latest technology.
Subaru provides a three-year limited warranty. See warranty policy