When you pulled your carbs out of the bike, you would have had to unscrew the carb tops. When the tops where loosened off, you would have withdrawn them from the carb. Below the carb tops (attached to the cable ) are the slides. Now poking out the bottom of the slide should be the needle. On the top of this needle (which is hidden inside the slide) is where you'll find the clip. To get to the clip, hold the slide upside down gather the spring in with your fingers and withdraw the brass cable keeper. Sometimes a shake will loosen it. After that's out, slide the cable end out of the cable mount. Now when you look down at the cable mount there should be two Phillips screws holding the cable mount to the slide. Remove these. Then the cable mount will come out. You can now see the top of the needle and the clip in question. Cup your hand over the top of the slide and flip the slide upside-down. The needle should fall out of the slide into your hand. Be careful to not let the needle fall. Now move your clip to the new position. With the pointy end pointing to the ground, moving the clip lower will richen and higher will lean out. Instalation is the reverse of the above instructions.