In the musical movie "Little Shop of Horrors" (1986), in the song "Feed Me (Git It)", the lyrics go:
Seymour: [Sung] Gee I'd like a Harley machine
Toolin' around like I was James Dean
Makin' all the guys on the corner turn green
Obviously whoever wrote the lyrics had to rhyme with "Dean" and "green", so "machine" fits, but is that actually what anyone would call a motorbike? "Harley machine"? Or maybe it's specifically intended to sound stupid/silly since "Seymour" is a very meak and "nerdy" character -- the opposite of who you'd imagine driving a motorcycle?