КАК выбрать китайскую бензопилу\КАК измерять обьем цилиндра?\HOW to measure a cylinder

HOW to choose a Chinese chainsaw, how to measure the volume of a cylinder, what are the differences between cylinders, we all look at this video.
And also the entire playlist of the chainsaw repair on my channel: https: //www.youtube.com/playlist? List = PL8Jd8hAXEJKo29Se4vLm4idWGouEzu0qe