Fuji Bicycle Co., Ltd., Tamura Town, Tokyo, 1952-54
Fuji Bicycle produced 147cc and a 250cc ohv, 4 stroke machines. The 250cc model was the DY-2. I've had trouble with the translation of the model name, which Google insists is the Fuji Moispit (富士モアスピット) and doesn't seem correct, but if I remove 'Fuji', it tells me the translation is 'Moose Pit' (モアスピット) which I also doubt. Looking at the ad sheet, it looks to be the Autopy (オートパイ). I'm sure someone will be able to supply me with the correct translation eventually.
At this point, I'm not sure how many years they were in business.