Have to snap the throttle to lower idle speed.

When I am out riding and the bike warms up the idle will sit high unless i rev the engine and let it snap back. Then it will idle like it should. I suspect something in the throttle linkages between the carbs. I already replaced the throttle cable and adjusted the play at the throttles to I am not really sure what else to do.

do you have any slack-play in the throttle handle grip...there should be a little lag before turning and tension on the cable...when the bike is cold-at rest...is there any slack in the cable where it hooks onto to the carbs

there should be some play in these two spots...also...if you have the bike running and turn the idle set screw at the carbs out...idle down...does it die eventually ...does the idle screw adjust/set idle like it should??

What he said. Also look at your cable routing and reduce any tight bends. Other than that what kind of carbs are they CV?

pb blaster 10w-d-40, 3 in one tranny fluid, motor oil whatever is clever.

-edit(you have to give these guys a break, they have no idea what the question is until somebody answers it)

donthaveakawman wrote: pb blaster 10w-d-40, 3 in one tranny fluid, motor oil whatever is clever.

-edit(you have to give these guys a break, they have no idea what the question is until somebody answers it)

so put it on the springs between the carbs? what about dirt buildup?

If the handle is to close to the controls it can hang up as well.

Disconnect the return cable and see if it still does it. If it doesn't do it then your return cable is either to tight or sticking. FYI, ignore any advice from donthaveakawman.

Can you simulate it in your driveway? Try it with cables off the carbs. If it does same thing this will tell you carbs or cables,throttle grip.

peter1958 wrote: If the handle is to close to the controls it can hang up as well.

Also, the throttle mechanism might be located to allow inside of the throttle grip to rub against end of the handlebar.

If not already done, would assure the grip isn't rubbing against end of the handlebar.

Good Fortune!

Not to but in here, but do you have a push-pull cable set up(2) If not, you will have to put another spring on the carbs to help them return to closed. Any auto part store will sell a spring assortment. Pick one that gives just enough tension to get the job done. This will however result in a harder throttle pull. Your bike should accept a push-pull set up and is the right way to go. Mine has a single so I had to add a spring. Stay safe.

Ok. It's been cold so the bikes been sitting for a bit. got it out today and the problem remains. I will ride it and once its warmed up I will rev the trottle manually and see if it idles high. It is a one cable system and the springs are strong, the vavles open and close like they should with no problems. I am wondering is the slides are sticking (vaccume slides). They come down very slowly and sometimes dont come down at all when I push them up with my finger. when I suck on the vaccume ports though the slides come right up with no problem.

as far as the cable goes, there are no tight bends and the handlebar is not a problem. the cable mooves freely.

It sounds like you are either running the Mikuni BS34 or the Kehein CV carbs. Do not oil the springs that will do nothing. Have you made any changes to the carbs or engine that preceeded this? If you start modding the carbs or engine you will probably need to adjust the idle mixture screws. If you are 100% certain there is no binding with the cable or linkage then it sounds like you are a little lean on the mixture screws.
The vacumn slides do not effect idle period. The idle sircuit is controlled by the pilot jets and idle mixture scews. You can let the bike idle and raise the slides manually and it won't do anything so do not start messing with those. They are supposed to come down slowly and they are controlled by engine vacumn.