YAMAHA PARTS LIST YF J - 1 50cc and 55cc YFJ-1K MOTORCYCLE SCOOTER MOPED 1964
This is a used original Yamaha YF(J)-1/ 50cc (55cc) Parts List there is also a separate section on the YF(J)-1 K (55cc). The separate YF(J)-1 K section has 12 pages. It might be a copy.