Вариатор.Не зная это - нет скорости,без вариантов .

🛵💨To save your time - the video is very compressed, but there is a lot of information = if something is not clear, press stop, or change the viewing speed ... Scooter variator. Theory, practice - what the belt, bushing, rollers, spring should be .... Without understanding these basics, you will never increase the speed, traction, start ... all sorts of alterations, settings, even increasing the engine volume, etc. If desired, only after this can you further modify something ... otherwise everything else is a monkey's work .. The TOPIC of the video is why the belt breaks. Selecting the length of the belt, how to measure what. What does the length of the bushing affect and when and why to put washers. How to install and remove a new or used belt. Selecting rollers and springs. How a variator works, nuances... If you have questions, write to me, I'll answer what I know. If you have comments or corrections, write to me, but provide arguments. Good luck.