Overhead Cam          > Print chart
14HP / EX40
   Performance Curve:
Performance Curve
Performance Curve

Engine Overview:

Engine Family Overview:
With nine models ranging from 4.3- to 14-horsepower, the Subaru Overhead Cam Industrial Engines lead the industry in technology, offering more power, less noise and easy, one-pull starting every time. Introduced as the first air-cooled engine line to use advanced chain-driven Overhead Cam technology, the Subaru EX Series provides maximum efficiency, performance and power with minimal noise and emissions. The engine design is extremely compatible and easy to install, and simply exchanges with most existing slant cylinder engines. 

  Class Air-cooled, 4-cycle, single-cylinder Overhead Cam gasoline engine
  Shaft Horizontal
  Cylinders 1
  Displacement 404
  Cycles 4
  Fuel Gasoline
  Max HP/RPM (Gross HP) (14.0)/3600
  Max KW/RPM 10.3 /3600
  Max Torque ftlbs/RPM 19.91/2400
  Bore x Stroke mm 89 x 65
  Compression Ratio 8.3/1
  Starter Recoil
  Dry Weight lbs 72.75
  Dry Weight kg 33
  Length inches (mm) 15.31 (389)
  Width inches (mm) 17.72 (450)
  Height inches (mm) 17.44 (443)
  Fuel Capicity US Gallons (ltrs) 1.85 (7.0)
  Lube Type Engine Oil SAE10W-30, 20W, 30W
  Oil Capicity Fl oz (ltrs) 32 (1.2)
  Air Cleaner Dual Element Two Stage
  Muffler (type) Rigid Super Quiet
  Ignition System Electronic
  Lube System Mechanical Splashing System
  Oil Sensor Electronic Low Oil Sensor
  Emission Rating Tier III EPA & CARB
  Color Black Standard
  Governor System Centrifugal Flyweight Type
  Fuel System Carburetor Float Type
   Key Features & Benefits:
Chain-Driven Overhead Cam Chain-driven Overhead Cam design offers superior power and performance with an automatic decompression system to reduce the required pulling force by 30 to 40 percent, and ensure starting on the first pull. EX engines start instantly – even at temperatures as cold as -10 degrees C – without any perceptible kickback. 
Dual Ball Bearing Crankshaft Support Dual ball bearing crankshaft support offers maximum stability under demanding loads.
Heavy-Duty Piston Rings and a Cast-Iron Cylinder Liner Heavy-duty piston rings coupled with a cast-iron cylinder liner resist wear and ensure a long engine life.
Optimized-Capacity Rigid Muffler 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.
Pent-Roof Combustion Chamber Pent-roof combustion chamber enables optimum intake and exhaust valve placement for maximum engine performance and efficiency.
Case-Hardened Steel Timing Chain Case-hardened steel timing chain allows for precision timing and maximum durability.
Metal Gas Tank & Tier III Gas Cap & Strainer
   Dimensional Diagram: