Needle jet RD500, 475 O-0
Keyster Produkt for original Mikuni Vergaser
Keyster = NJM14R / (475 O-0)
there are different statements and opinions regarding the needle jets.
according to the original Yamaha data sheet:
84 = 47X = 475 O-0 with #195 main jet
Year 85 = 1GE =475 N-8 with main jet #165
According to the original microfiche, there are different ones on the front and back...?
the majority, if you do some research, have 4 identical needle jets in them, but without guarantee.
The original number of the manufacturers serve only for comparison purposes and may not appear on bills.