Right, lets get rid of the urban myths here and give you 100% facts
(please feel free to check against the info gained from 25 yrs experience)
all bikes was supplied with 1 cable but thanks to our american cousins, they insisted there was a 2 cable system fitted for the reason of safety...
Like your cable will snap and the throttle linkage sieze at the same moment

Ive worked at a Honda main dealers as well (Bill Smith Honda, Liverpool) and still never heard of this bizzarr situation ever arise
The fact that there is not 1 return spring on the throttle linkages, there is more likely 4, 1 for each carb/ throttle body to control butterfly valve closure and apply the same pressure to each to control tick over positions.
As far as throttles go, throttle bodies and carbs are exactly the same in respect of the cable operation so a QA will fit eitherThe conversion back to 1 cable is NOT for weight saving.. its to make the throttle control precise. As kerm pointed out, if its on a 2 cable system and its not synced precislly there will be a over lap of operation between open and close that will counter act the next operation for a split second and cause a surge as more pressure will have to be used momentererly. Not good when your cranked over and you pull on the throttle to exit a corner.
As far as a damaged cable causing a problem, you will feel it or it will snap well before it becomes a problem, if this 2 cable system had basis, why is it not fitted to car throttles or lorries/ buses/ coaches that would be a problem if it stuck?
I have worked on HGVs, PSVs, PLG and never seen a 2 cable system fitted
2 cable system is bollox and the fact that prob 90% of them are not adjusted properly so in itself causes problems.
Cable will become extinct soon as its all going fly by wire but in the mean time, get that shite 2 cable system out and go back to what we know is the best system,
1 cable - single smooth operation
Still not convinced?
PM Phil Seton Racing, Ihe will say exactly that as well ???