Just picked up a used Saito 125a (my first four stroke) and need some basic help. Also, Ilooked at the owners manual online and found it very generic and unhelpful. First off, I am unsure what the metal barb coming of the crankcase backplate is for. Is this a breather? Does it need a line running somewhere? Also, the high speed needle adjustment screw only adjusts 5 "clicks" before it hits a definite stop (both ways). Seems like that would not be enough adjustment for all altitudes and conditions. Thanks for any help you guys can offer!