You would turn it out, that means to the left so it will shift faster and turn it to the right that would be turning it in, makes it shift later or if you tighten it all the way in you will have only a first gear. Some time dirt or other things stop the shift. so you might want to turn the grub screw all the way in to the right and just snug it down don't force it tight. Then start turning it out try two turns first and see where it shifts at and then go from there.