Model Engine Company of America
Back Cover or Rear Cover
Refers to the cover on the back of the engine.
Front cover of Front Housing
  Refers to the removable housing the crankshaft rides in on some engines
One piece case
  Refers to a crankcase that houses both the cylinder and crankshaft
Two piece case
  Refers to a crankcase that has a bolt on front housing.
Power Take Off
a type of porting used in 2 stroke engines named after the inventor.
Loop Scavenged
a type of porting used in most older 2 stroke engines
Cross Flow
  a type of porting used in most older 2 stroke engines
Dykes Ring
"L" shaped piston ring
Rear Intake Side Exhaust
Front Intake Side Exhaust
Rear Intake Rear Exhaust
Front Intake Rear Exhaust
Rear Intake Front Exhaust (marine engines)
Usually refers to the bearing the crankshaft rides in.
Ball Bearing
Usually refers to the crankshaft riding in one or two bearings
Single Ball Bearing
  Normally on the rear portion of the crankshaft closest to the cheek or crank area while the forward portion is either running in a bushing or directly on the aluminum.
Double Ball Bearing
Refers to the crankshaft riding in two bearings. One in the front directly behind the prop driver and one in the rear close to the cheek
Prop Driver
  The knurled hub that's secured to the crankshaft either with a tapered collet, solid taper to taper fit, hole with flat, hole with 2 flats, broached spline, square hole, or keyway.
Heat sink head
Refers to a cylinder hear with extra cooling fins.
Normally used on a car or helichopter engine.
Wrist Pin
Is the pin in the piston which the connecting rod pivots on.
Less commonly refer to as a piston pin
connecting rod
The rod that connects and transfer piston motion to the crankshaft.
Intake or inlet port
  On a 2 stroke engine the fuel air mixture enters the crankcase through a timed valve, either via a port on the crankshaft, a rotating disk or drum, a reed valve, or through a port below the piston which is timed by the skirt of the piston.
Draw Bar
  A bar the holds the carburetor in place. Usually pulled one direction with a nut. Some are two pieces and pulled together with a screw.
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The above information is provided as a guide. Since MECOA/K&B has no way of determining the ability of the individual using and understanding this information, we assume absolutely NO RESPONSIBILITY for any damage to person or property from the use of this information.