Doing a bit of shopping and see that there are 3 optional needle jets (the part that hods the jet) available for the KX 65, 0-0 being stock. What are the differences associated with the different part numbers? Perhaps some one can enlighten us a little about needle codes and what they actually do.
the first isnt a zero it's an O as in oscar this should help , the bigger the second number, the larger the hole so it would make a richer needle jet