Hi everyone

Tried searching for this but came up empty... I have a 2019 Vespa Primavera 50cc 4V4T. It uses a NGK 8mm plug. All the Compression testing kits that I was able to find, only go to 10mm adapters. First question, do 8mm spark plug adapters for compression testing kits exist? Secondly, has anyone ever performed a compression test on a Vespa 50cc 4V4T, if so, what did you use as kit?

Thank you.
Frank