I just read the one article about modifying the slide on a sha to create more of a nozzle effect to lean it out but it only affects the mixture at anything before 1/4 throttle. I don't know much about mopeds but this place has definitely helped.
Also no word from 77 yet.
Anyway what size carb do you have on your 7. Plus that thing looks amazing and makes me want to clean mine up.