As the cables get older they are prone to sticking due to them flattening out where they protrude from the front of the airbox.
The main fix for it is ...
Remove the airbox & locate the front mounting point on the frame(for the airbox mounting lug) and bend it up slightly to relieve the downward pressure on the throttle cables when the airbox is in place.
It may also help by gently squeezing the outer cables back into shape with pliers (as they do flatten and bind after time).

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I just got some new cables. so we will see if that fixes them.


Nipz~

 

New cables, new throttle sleeve and still no good. mad sure the cable was not to tight.It is now very smooth but i have to replace the throttle return springs in the carbs to get it to snap back. right now it slowlty come back. take about 1sec -1.5 to return.


Nipz~

 

This is exactly what fixed my F2's sticky cable after it sat for about a year without being ridden. It went from being dangerously sticky (as in pretty much unrideable) to snapping back just like it should. It did take a good bit of WD40 in both ends of the cable but it did the trick.

 

I just bought a 93 CBR 600 about a week ago. My throttle was sticking also. what i did was i removed the bolt from the side of the grip and found out that the rubber washer in there had deteriated and was gumming up the throttle. I cleaned that up and put in a new washer and it snaps back perfectly now.