Few reasons...
Make sure the cable doesn't have any tight bends in it.. It needs to be as straight as possible..
Remove the throttle grip and clean under the bar. Corrosion and grime between the tube and the bar often make them stiff.
You could try oiling the cable too... Will quite often sort it..
Also, check on the carb. If the throttle "return" cable is tight, if stiffens things up..
If all of those don't fix it, just buy new cables (yes there should be two... Probably)
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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