One of the ways you can make your throttle more responsive, is to increase the size of the throttle pull located on the end of the throttle tube. This is a common practice in the off-road world. Many off-road aftermarket throttle tubes offer interchangeable cable pulls which allow you to multiply the amount of pull when you twist the throttle. The larger the diameter of the throttle cable pull on the end of the throttle tube, the faster the pull. If your bike is carbureted, you can adjust your jetting, or your accelerator pump for a better throttle response.