Follow the throttle cable down to where it screws into the carb rack, you will see the lock nut and barrel adjuster, loosen the lock nut and twist the barrel ajduster to tighten or loosen the cable freeplay.
You may want to check the tech section for the correct manual but if I recall the spec is approximatly 2mm gap/freeplay on the throttle lever to throtle housing itself.
Once you have that set you may want to check and reset your oil pump freeplay as well as they are both driven by the throttle.
Hope this helps