G'day MickyD

I hope some images are forthcoming from members.
I have just uploaded an operator manual for an 82-213: -
https://www.outdoorking-forum.com.au/forum/ubbthreads.php/topics/89444.html

If you can regulate the throttle by moving the throttle butterfly shaft, then
this might indicate an issue with throttle springing.

This machine would have originally had a flexible Bowden throttle cable.
Your images do not quite reveal the throttle set-up on this Walbro carby.
Does it have a throttle spring to keep tension on the throttle?

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Jack