79 gs850g- Throttles up on its own

[Guest]

When I give it some throttle, it will rev it's self to about 4.5k rpms. It wont come down unless I flick the throttle a few times. Makes shifting hard, rough ride, and downshifting super hard and sketchy.

I have checked the throttle control and cables. Cables are clean, rust free, and move freely. Throttle will snap back to place where it needs to be. The rpms dont reflect that though. I dont know what else to check.
Where should I start looking?

[Nessism]

http://www.thegsresources.com/_forum/showthread.php?171846-Top-10-Newbie-Mistakes

Check item 2

[BiggBellsMoto]

I just ordered new pods and made sure they are the right size and good quality to make sure air is not getting sucked in at boots. I was having this issue before I pulled the air box too Any other avenues I could stumbled down?
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[KEITH KRAUSE]

Like Ed said. Good chance you have 1 or more intake manifold o-rings leaking. They get hard and crack and cause the rpm's to rise.
Robert Barr, a member here, sells the intake o-rings you may need. They're only $4 or so for a set of 4, plus shipping, which is cheap too.
If your manifolds still have the original Phillips heads, be careful to not strip the heads when removing. Use an impact screwdriver and a GOOD fitting bit. Replace those things with Allen heads. Be sure the manifolds themselves are in good condition. Use a light coat of silicone grease or high temp bearing grease on the new o-rings to help them last. Torque to about 8 or 9 ft/lb.
I assume you've changed the jetting? You'll need to increase the main jet, raise the jet needles, play with the pilot fuel screws and remove the 2 floatbowl vent lines to minimize fuel starvation, especially at high speeds and in crosswinds. Raising the stock jet needles will help but jet needles from Dynojet would be better. You need to compare your jet needles to a '79 GS1000 and see if they're the same. If so, a DJ stage 3 jetting kit would be much better than trying to buy separate mains and working with the stock needles. Also, when you disturb the jet needles, you must do a good bench synch and follow that with a synch with a vacuum tool.
Changing to quality pods requires these changes to the jetting. Otherwise, you'll run VERY lean and you don't want that. The above suggestions assumes you have a 4 into 1 pipe and the jetting kit is made for pods AND a quality pipe.

[azr]

Lots of good advice here. Sounds like you need to pull those carbs and check things out along with the intake boots. Sounds lean, lean,lean.