Wierd high idle problem! Help! Solve the problem win a prize!

[ben2go]

I was going to post Kerry's valve adjustment vid but appears to be gone.

[bombjack]

I was going to post Kerry's valve adjustment vid but appears to be gone.

http://video.google.com/videoplay?docid=-2015554469142545363

[ben2go]

I was going to post Kerry's valve adjustment vid but appears to be gone.

http://video.google.com/videoplay?docid=-2015554469142545363

Yep and I get nothing but a list of vids.Kerry's video doesn't come up.

[bombjack]

I was going to post Kerry's valve adjustment vid but appears to be gone.

http://video.google.com/videoplay?docid=-2015554469142545363

Yep and I get nothing but a list of vids.Kerry's video doesn't come up.

That's weird. When I click the link, Kerry's video starts playing 

[EdE]

I just bought a 2000. Ran great when I picked it up, all freeway all the way home so I didn't notice anything. Road it to work the next day and the dreaded mystery high idle at times.. over a few days searched the forum and tried a few things. First I lubed and adjusted the throttle cable and gave it a little slack. Nope. Read about the seeming sensitivity to leanness, found out where the airscrews where, found a small screwdriver, checked and found that the PO had removed the screw covers. So I turned the screws in (with the carbs on, engine cold) and counted three turns, from the info on here, stock jetting (probably.. I didn't remove the carbs to check but everything else is stock) stock airfilter I set them at 2 turns and readjusted the idle, Bingo, mystery high idle at times gone! over the next couple days I fine tuned the idle speed, first it was a bit low after the commute, then just a bit high then you guessed it, just right.. I like it a bit higher than the recommended 1250RPM though. Yeah it seams these bikes are really sensitive to carb adjustments.. When I get a chance I want to get the jet kit to richen it up just a tad, I hear it helps A LOT. Ed

[dsmgs500]

were are these airscrews you speak of?

[EdE]

On the very bottom of the carbs, at the front of the float bowls, right in the middle of each carb bore. Using a small flatblade screwdriver pointed straight up you can just barely adjust them without removing the carbs (if the little caps that cover them from the factory have been removed). Ed

[ben2go]

were are these airscrews you speak of?

Read through my write up will help explain where everything is on the carbs. http://gstwins.com/gsboard/index.php?topic=56601.0

[dsmgs500]

so list of things to go through from easiest to hardest

1. Rubber seal check
2.Airbox rubber seals
3.Throttle linkage
4. choke linkage
5.Mixture screws
6.valve adjustment

am I doing this right? Missing anything?

[NickyNumbers]

so list of things to go through from easiest to hardest

1. Rubber seal check
2.Airbox rubber seals
3.Throttle linkage
4. choke linkage
5.Mixture screws
6.valve adjustment

am I doing this right? Missing anything?

Considering you've already done everything else, I say start with the mixture screws. 


First turn them both down all the way.  Turn down the idle screw as well.  Then turn out 1 turn, start the bike.

Test.

It'll probabably stall and shut off.  Then turn the screw a bit more, closer to two turns.


Test.

It'll probably hold the idle a bit better.  Start adjusting the idle screw.  If it doesn't go down further, shut off the bike.  Turn the mixture screw out a bit more.

Test.

Keep doing that until you find your sweet spot.  Remove plugs accordingly to see where you are at. 

Good luck!

[scratch]

Add carb vacuum balance/synchronization

[bombjack]

Any news on this?

[KatCycle]

I had the same exact problem with my bike! A valve adjustment followed by a carb sync fixed that right up

-Katlynn

[dsmgs500]

I haven't worked on it yet, I will try to get some work in today.

I did take the plugs out. My left side looks whiter than my right side. Left is a bit chalky,right is chocolately. Does that say anything?

[ben2go]

I haven't worked on it yet, I will try to get some work in today.

I did take the plugs out. My left side looks whiter than my right side. Left is a bit chalky,right is chocolately. Does that say anything?

Lean on the left and rich on the right.Dirty carbs and possibly a plugged pilot jet on the left.

[dsmgs500]

I haven't worked on it yet, I will try to get some work in today.

I did take the plugs out. My left side looks whiter than my right side. Left is a bit chalky,right is chocolately. Does that say anything?

Lean on the left and rich on the right.Dirty carbs and possibly a plugged pilot jet on the left.

First time I cleaned them out, I didn't do a good job. Second time around, I used a wire brush and poked through all the holes, runs way better.

[dsmgs500]

Could richening the side that is a bit more lean, solve my high idle?

[dsmgs500]

also where is the carb sync write up? I can't find it

[ben2go]

Here is the tool that most of us use.I fill it with red two stroke oil.
http://www.powerchutes.com/manometer.asp

Warm the engine so you don't need choke to start it.Set the idle to 1200rpm and shut off the engine.

Connect the hose ends to the upper vacuum ports.Make sure they seal tight.

Start the bike and watch the fluid.If your carbs are sync'd/balanced then the fluid will remain at the same level.

If not, locate the balance adjustment screw between the carbs.Very slowly turn the screw in very small amounts.Watch the fluid in the tube.If it continues to rise as you turn,stop and slowly turn the other way.Very slight screw movements can really affect the carb balance.Your idle will change as the carbs balance.If the idle picks up,adjust it back down.If the fluid get sucked into the engine,don't freak out.Make a mental note of which cab sucked in the fluid and turn the screw a half turn the opposite direction,ie right carb sucked fluid then turn screw 1/2 turn to the left.Refill and restart the engine.Then try again.

[dsmgs500]

FYI When I choke it, It bogs. Other than that it runs fine. Is that a clue to anything?