I would take the intake tubing off to see the shaft and the butterfly plate and watch it as you push it. Maybe the 2 screws on the plate are loose and allow the shaft to move and the plate shifts and causes the RPM change.
The left carb is not solidly connected to the right carb. There is a linkage with the sync adjust screw that allows some play between them.
If that is a fuel leak you should track it down, but if a green liquid I would suspect coolant.
I think I cant see the screws you tell from just taking out the intake tubing, because there is the bike frame (mine has the air intake built int tha bike frame). I will recheck the carb linkage screws and sync.
But will be easier taking it out to try to inspect it better... this will be the fourth time
(I took it out carefully each time, like a baby... ups, drop it again sorry
). But now I know little more and have more to look for.
I dont think the green/bluish liquid is coolant (mine is yellow), and from left side there is no coolant hoses (anyway will check it better) fuel here is more kind of bluish color.
Will also check float levels again, I just discovered that my service manual is not correct it says 84-85'+ BUT that 85+ is not 86'. So searching the forum found the 86-87' and float levels are not the same
so I might be a little lean.
Also came up with a good description somewhere about wrong float levels synthoms and how to test/set them right, anyway any extra hint is really appreciated
Symptoms of Incorrect Float Heights
In an extreme case, if the floats are set too high, fuel will overflow via drillings inside the carb body. In addition, fuel may flow into the engine unrestricted, which, if the engine is not running, can cause hydraulic lock – that is, as the piston rises on the compression stroke it cannot compress the fuel.
If fuel is leaking from the carb, it can potentially cause a serious problem – fire. If the fuel height is too high but the bike is running, the engine will have a tendency to display a rich running condition, which will make the throttle response slow and the engine note muffled. This condition is generally accompanied by a strong smell of unburnt fuel from the muffler. If the fuel height is too low, the engine will display a lean running condition, where the engine typically hesitates before accelerating or surges as the throttle is opened. The bike may also misfire when the throttle is closed.