I don't understand my Carburetor...

[Deleted]

Yesterday i readjust the carburetor (after a 15 minutes ride) beacause the idle speed was to low.
I put the scooter on the center stand and make the adjustement.
After the adjustement, i have a nice idle speed

But when i put back the scooter on his wheels, the idle speed drop a half!

I play with the idle screw, on his wheels, it was too fast or too low i can't have the correct speed... I check the air\fuel mix screw, samething...
And when i put back the scooter on the center stand, it was ok!

I also check all the vacuum tubes, all good.

Do you see something like that before?

[tango]

Perhaps this has something to do with the position of the fuel in the carb bowl. Put it back on the centre stand, but this time raise the front wheel up as best you can in order to mimic it being on level ground. See if and how the idle changes as you raise the front wheel. Then, bring it all the way up until the rear wheel touches the ground to see if there are any further changes. If there are then perhaps the float in the carb bowl is malfunctioning in some way.

[bigjeff]

perhaps the throttle cable is routed wrong and being on the stand or off changes the pull on the carb throttle lever

[pushin30ridindirty]

this might sound stupid, but it happened to me so its worth a shot. Have you pulled the carb bowl and blown some carb cleaner through the pilot jet? I had a little piece of debris in there that was just enough of a restriction to let the bike run when the tire was off the ground and free to spin, but once back on her wheels it'd try to die. Turned out the pilot jet just needed cleaning. A good carb cleaning is always a good place to start with any idling issues IMO.