yes, u can adjust up at the throttle tube on the handle bar. Those 2 metal curved tubes coming out of the throttle assembly the throttle cables are attached to have nuts on em. loosen the nuts and then spin those tubes out a bit. then tighten up the nuts back up.
this probably doesnt make any sence to u cuz its too early in the morning for me to try and describe sumthing like this w/o a pic. but once u take a look at it u'll see what im talkin about and can probably figure it out on ur own.
Coming out of the throttle assembly you'll notice the two lines. One has a 10mm lock nut. Loosen that up and turn the 8mm adjuster to get the freeplay you desire. If it gets looser turn it the other direction. When done tighten the locknut again