JAWA 2-stroke power tuning 559 575 579 573 (Part 1)

Welcome to a little insight of how to get about 35 HP from a 1960s JAWA 250 resulting in a top speed performance of almost 150 kmph. Feel free to have a look into Part 2 video showing further details on the way into the skies: https://m.youtube.com/watch?v=W1YrpF2KWvY&t=42s And how does it feel to ride this bullet? Just hop on for a minute: https://m.youtube.com/watch?v=PBuOenjxlgU&t=5s The entire “making-of” in writing can be found here: https://forum.jawafreunde.de/forum/index.php?thread/22776-projekt-jawa-573-ultrasport/