EX Series Engines

Subaru EX Series engines utilize high performance chain-driven overhead cam technology.

Ex21 10745804
Logo 10933091

Subaru’s EX Series engines are the first to utilize high performance chain-driven overhead cam (OHC) technology in the industrial air-cooled market.

  • Four models: EX13, EX17, EX21 and EX27 models, which produce 4.5-, 6-, 7- and 9-hp
  • All models comply with both EPA and CARB emission regulations
  • Chain-driven OHC technology allows the intake and exhaust valves to be positioned for optimum engine performance; lowers resistance for the air/fuel mixture flow
  • Pent-roof-type combustion chamber able to utilize high compression ratio
  • Automatic decompression system reduces required recoil pulling force by 30 to 40%
  • Starts are fast with no perceptible kickback
  • Fewer parts for less mechanical noise and optimized-capacity rigid mufflers make the EX engines a full 2dBA quieter
  • Heat dissipation fins built into mounting base, cylinder and both the inner and outer crankcase surfaces
  • Allows for 360-degree airflow around both the exhaust and intake valve stem areas
  • Oil scraper attached to the connecting rod supplies oil to the cam chain which then carries the oil to the overhead cam and valve train
  • Rocker cover design and breather system keep the camshaft and rocker arm in oil, prevent spouting
  • Simplified maintenance through high parts commonality; over 50% of parts shared
  • Ideal for use in general construction equipment, compaction equipment, portable generators, pumps, compressors and other industrial engine applications
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