I don't think the cable has slack in it, it's more that the linkage has slack that seems to be designed, for some reason. I wondered if anybody else finds this a problem, or is mine set up wrong.
When you open the throttle, if you look at the engine end of the cable there is a LOT of movement before the linkage starts to open the throttle. Initially I thought that it was set up wrong and the slack should be as the throttle is closed, to enable the throttle to close slowly when you lift your foot right off, but I don't think that is the case.
BTW the 190 has injection, the carb models may be different.
I am located in south east England in the couty of Kent, near a town called Tenterden.