I've already installed a reed valve on a Ural chainsaw, as you can see in the previous video: https://goo.gl/2SaJrb . In this video, I start the engine and test it. In the previous video, I installed a Yamaha Jog reed valve on a Ural 2T Electron chainsaw. For the reed valve to function properly, a third purge channel needs to be installed in the cylinder, but I haven't done it yet because I want to test how the engine's performance changes with each modification. This is the beginning of this engine upgrade, and there will be more videos on this topic, plus a test drive on a moped after each modification.