It may still be a Schwinn Frame, it looks prewar, because the front downtube is straight, not curved.
. Front fork is a Schwinn locking fork if the frame is correct it will have a tang inside the frame toi hold the lower neck cup.
Front sprocket does not look like what Schwinn used,. is the Motor a Clinton 700 by chance, it may have been a kicker motor.. used in some scooters.