Assertion: moped's engine | /r/CapableOf | mount in the frame
Facets:
value: forward
type: MANNER
value: behind the rider
type: LOCATION
value: under the frame
type: LOCATION
Source sentences:
text: an engine or motor mounted in the frame (called a frame mount), under the frame, or behind the rider (called a rack mount) may drive the rear wheel via a sprocket with a chain or a rubber belt.  
text: Underbones (including models like the Honda Super Cub) have the engine mounted forward on the frame.