Stucked throttle?

Yesterday i had the second time a strange throttle behavior:
It was cold ~0°C but i think that it was not frozen!
I only can accelerate a little bit more than Idle speed because of the stucked throttle. It was only enough for 30km/h (i think something about 20mph) with cold engine and it slowed down to 20km/h (~15mph) with warm engine. With more force i was able to accelerate up to 50km/h (~35mph)
Then i turned the throttle in the wrong direction (with a little bit force a little bit more than idle) and after this i had normal ops of my throttle without any high force!

Have someone an idea whats the reason for this behavior?

Is it possible that the grip was rubbing or binding against the bar end vibration damper? I've seen this happen before, but usually only after the bike has been transported and the straps were wrapped around the grip, pulling it outward.

The previous owner installed other grips so that there are no vibration dampers installed anymore...

I also suspected the grip but i had this 2 times only with cold wheater. At 2pm with "warm" wheater (~5°C) i had no problems, parked the scooter and at 11pm i want to ride home with "cold" wheater (~0°C) and had this problem. After this at the next day everything ok again...

I think it is realy caused by the temperature but i'm wondering that it is not all the time if it is cold. Many other times with temp ~0°C i don't had any problems...

It just takes some condensation somewhere to freeze the cables. Any water in the lines would freeze up even after you ride as the cable part that is frozen could be the bit in the airstream chilling it further.

Next time try a hair dryer and move it gently around the throttle assy and exposed cable.

But why it stuckes very serious if i want to accelerate and if i turn the grip in wrong direction it works after this without any problems, high force or anything else?

Sounds to me a that you may very well have a worn cable, Honda always use the 'push me - pull you' system of two cables to ensure that in the event of failure you can always close the throttle.

It doesn't take very much for the cable to wear somewhere inside the sheathing and become 'sticky'.

It's also possible that somebody in the past has tried to lubricate the cable with a hydraulic lubricator (which forces lub down the casing), the problem with this is most lub oils (WD40 etc.) make the nylon liner swell causing the inner cable to bind. Just a thought.

If its an issue then I'd take it off and double check it for operation, replacing it if I thought it was going to impede my riding.

I think it is a shitty work to change the cables because of removal of many tupperware...
The next days if i'm feeling better (i'm a little bit sick) i will check the ends of the cable and if there are nothing to see i will observe it.

Btw have someone the Service manual in a good digital quality? I'm looking for it but only found a ebook in bad quality (in german, but i also will take it in english)