Took some time and parcipated an amateur karting event. They let me race with soviet era karts. There were two classes "Retro N" that is all soviet (frame, motor even the tires are old, made last century). And ´"Retro A" where you could use new frame and tires and even modifye motor a little bit, but motors were soviet made Minsk, CZ or MZ. Reason for me racing with them and not in open class with rotax karts was, that retro had 10 laps but rotax 15. And for me 10 is max i can race.
I had worn rear brakepads and brake fluid started to boil in 7th lap in first race so last 2 laps were without rear brakes. Then I got a little better pads and next two races it almoust worked 10 laps
Tested also a cheap ACME 360 cam, so here is two 360 youtube videos from race 1 and race 3.