Came across this good looking little (tiny) bike, went on to short life LC (have seen them before). -- https://www.ebay.com/itm/NOS-Yamaha-RD-80-MX-1982-1985-Original-Factory-Sales-Brochure-RD80MX-12G-CX87/312220113609? --- http://www.motorbikespecs.net/index.dyn?flag=13&make=Yamaha&model_id=2147616&model=RD+80+%28Air+cooled%29&year=82-86 --- https://www.cyclechaos.com/wiki/Yamaha_RD80LC
Reminds of a Honda MB8 or MBX.