The discovery was made at 9:45 a.m. Sunday off Quail Run Road in Pemberton Township.
The prosecutor's office said the motorcyclists were riding on a trail when they discovered the body in a wooded area off the road.
The body was in an "advanced state of decomposition," Public Information Office Joel Bewley said.
An autopsy is planned for Monday, but no further details were being released.
There was no word on if authorities had identified the body.