How many times have you looked for parts for you motorcycle but your not sure what model you have?
I maybe able to help out. By sending your engine & frame numbers i should be able to tell you which bike you have.
Honda &Yamaha parts
Engine no: 1A1-000123 RD 400 C 1976
Part no: 275-11681-00 crank pin TY 250 A 1974