All of the other respondents have focused the actual throttle barrel, and good advice there as always.
However I read (possibly incorrectly) that you have identified a cable problem.
The cables come dry-lubricated and should not require further lubrication in service. That said, even if yours are on their way out, you can secure a little more useful life from them by lubing them up.
Firstly, order new cables. Spare cables should be part of the basic "spares kit" that all airhead owners should have on hand at home (and take with them on long tours).
Next free the handlebar end of your cables (If you have the later 3 cable setup , same advice but you need to go about it differently).
Once upon a time I would have talked about using a funnel and plasticine to introduce oil into the cable and then leave it for a day or so to soak through.
There are better "high tech" solutions now.
Firstly a cable oiler something like this will do perfectly
http://www.ebay.com/itm/Universal-Motorcycle-Dual-Cable-Oiler-Luber-Lubricator-Tool-for-Suzuki-Models-/111118277845Then some really high-tech modern aerosol chain lube like:-
http://www.supercheapauto.com.au/online-store/products/Silkolene-Titanium-Chain-Lube-Gel-500mL.aspx?pid=338124#RecommendationsThis stuff is my new favourite chain lube, using it on everything that moves at my place.
Anyway, fit straw to can, shake well and then apply using the instructions with your cable oiler. Non-sticky, doesn't run and the PTFE cannot do much harm either.
Frankly this is the best stuff I have ever put on a chain and I am thinking of a Viking funeral for my tin of Duckhams.....