Make sure your throttle sleeve is free. Have you had this apart lately? Do you have stock bars?
On the throttle end you have the two cables coming in. The top one is the pull cable and the bottom is the push cable. You will find the cable housing has a fitting that will fit a wrench (8mm) and there is a jam nut that requires a 10mm wrench. Loosen the 10mm nut on both cables. Now if you thread the cable housing in towards the nut that is loosening the cable tension. Run both cables in fully. Look at where your cables attach to the throttle bracket at the carbs. You should see the cables now have some slack and should not be taught. Now with an 8mm wrench (or usually even by hand) start threading in the direction away from the jam nut on the top cable. With the cables loose you should have freeplay in the grip. In other words it will twist a bit before actually moving the throttle arm at the carb. Turn the adjustment out a little at a time until you get just a slight amount of freeplay before moving the throttle. You do not want full tension on the pull cable at rest but with just a little bit of a twist you want it to start to open the throttle. Once you get it there, check to see if it snaps back. It should. Then do your bottom cable. On this one I like to turn and watch the carb end as I go little by little to get almost all of the slack out of the cable. Not under tension but not sloppy.
If you do the top one first and get the freeplay out but till have no snap back, loosen the screws that hold the control together a little and check for snap. If you get snap after loosening, then something is in a bind inside the grip area.
