Cylinder compression 1970 sprint

Dear bro...


I have some problem with my vespa. I feel the cylinder compression not good

For detail please check the video.


1. First problem is gap between cylinder and piston approximately 0.25mm-0.3mm. That condition has normal or not ?

2. When i push the piston i hear sound like tuk...tuk..tuk..

The sound indicated my conrod have problem ?