I have my own opinion of what this is but I am wondering
what the procedure is

I assume this is a throttle response test used to check for low end
mixture problems.

My Guess
Eng at operating temp,with a clean spark plug ,from idle,quickly crack the throttle until you get past
the lag/hesitation without letting it rev high enough to clear the plug.Repeat several times and check spark plug
to see if you are lean or rich- make adjustments as nec.

What do you think
Tom

 

Gaff had one of the best descriptions I've read in a long while in a past post... it is the next to the last post or the 6th one..
it may be worth a read.."Still haven't got the jetting right"
hope this helps..