As they are 2-smokers there are half the 'reversals' in the drive system as with a 4-stroke.
Also it only needs to run 30 or 40 seconds as it is a drag machine.
And to tell the absolute truth, the guy writing the article would be loath to point out any problems so we don't, and will never know, if it really works for more than a few minutes.
Yes indeed, I too would like to see a pic of the drive train.
That square section front tire [rather that round contour] looks scary for a high speed mini. The builder should have known better, I'd think.