1993 GS500E Throttle Stick/High Idle HELP!!!

[EricVillanueva]

Whats up everyone,

Recently bought a 1993 Gs500e off craigslist for my first bike and It rode perfectly fine to get it home from the original owners home. After a couple days of awesome riding, while riding back home from a long ride the bike began to bog out and eventually stalled on the side of the road. After checking everything, and numerous amounts of cranking the bike and emptying the float bowls i was able to just get the bike home instead of getting it towed. I suspected it was a carb problem and it needed to be cleaned, and also the low end of the bike was running a little rough and i needed to give it a decent amount of gas to get out of first gear.

Suspecting it was a normal carb problem, I decided to take apart the bike and clean the carbs. This is my first bike, and I was able to figure it out and now i can take the bike apart in 20 Min. After cleaning the carbs the first time, the bike started up good and i was excited to go riding again. Right when the bike started it started to idle at 3000-4000rpm. After taking a short ride the street i noticed the high idle and the bike began to bog out and stalled. I got the bike home.

A few days later, I decided to to the carbs again, so I took the bike apart and cleaned the carbs and jets real well, and even added an inline fuel filter on both reserve and main fuel lines from the tank. I even ran sea foam through the gas to clean anymore shaZam! that could stuck in the carbs.

After numerous times of taking the bike apart, and cleaning the carbs, I finally have gotten the bike to idle at 1500 RPM, but now have run into the problem of the throttle sticking and i cant figure it out! The bike will idle normally, but when i blip the throttle it will sky rocket and stick at 5000rpm or even 7000! I lubed the cables, the throttle snaps right back, and even adjusted the nut so there is not much slack. I lubed the throttle cable from the top end and ran it down, and even sprayed WD40 on the cable around the carbs. Also, I sprayed WD 40 around the intake manifolds and lines and there are no fluctuations of RPM's which makes me assume its not a vacuum leak. Also, if the bike is idling fine i don't suspect its a carb problem either. I just need some more opinions before I take it to the shop...I JUST WANT TO RIDE! As it seems a little to dangerous to ride with a sticking throttle. Think i just need a new throttle cable?

I am looking forward to responses. Thank you.

[Supa]

Check your valve clearances. That was the issue I had with the jumpy/sticky throttle. I like to start shallow and work deeper. If your lines are good, your air filter connected, your carbs clean, then check your valves. Mine came about with a tight exhaust valve. Threw in a new shim and no problem.

To give you exact details: bought the bike with the idle set around 4k RPM since the PO had no idea how to fix it (and he was studying to be a mechanic  ). I turned the idle down to about 1200-1500 RPM. Come to a stop and it would die. Bring the idle up slightly and it would shoot to 4k rpm idle. Found a sweet spot that wouldn't die or jump idle, but eventually would jump once the bike was warm. Replaced fuel lines (old anyway). No fix. Checked plugs, fine. Cleaned carbs (pretty clean already). No fix. Checked valves, left exhaust was way too tight. Replaced with a shim to give me .08mm clearance. Ran perfectly after adjust the idle.