Rey’s Speeder: Info. Graph + Transparency
Rey’s speeder is categorised as a repulsorlift vehicle. A repulsorlift vehicle creates thrust by pushing against the planets gravity (fancy name for a hovercraft). Rey built her speeder through parts acquired from the Niima Outpost junkpiles, Starship Graveyard and the Teedo traders. Her eclectic array of parts (from military hardware to civilian machinery) classifies her vehicle as a hybrid: speeder and swoop. Rey’s speeder is comprised of duel turbojet engines salvaged from a cargo-hauler. In addition, Rey recovered air amplification intake ducts from an Imperial gunship and an array of repulsors from X-wing fighters.
Some speculations: Due to her mechanical knowledge, it would be conceivable that Unkar Plutt recruited Rey to work on the Millennium Falcon. This might give explanation to her rather unrealistic and detailed knowledge of the Falcon portrayed in the movie. Rey was easily able to ‘bypass the compressor’ because of her expertise in mechanics - not from sheer luck.