It's a Bird
this bike has 10 in wheels a spring fork tubes and it looks like maybe the motor was hinged off center down tube,rear wheel has 4in shoe brake. no numbers that I can find. looks like a good one to restore.
It's............Oh how the hell should I know?!
Welcome to the OMB, pictures help a great deal!
Cat Wildcat. 4" brake is a dead giveaway.
Maybe an Endura MX if it is a Cat, that would explain the engine plate tilt.