I refurbished my 1965 cb160 and when I try to start it (cold state) I must run the electric starter alot and it putts and putts but wont start.... It finally starts after jacking the accelerator while trying to start.... To keep it running , I must jack the accelerator till its warm.....after warmup......it runs perfectly........ I can turn it off and hit the electric start one little bit and it starts right away.... does anyone know what is wrong sith starting when it is cold.....?