Hello guys I have a 63 ccm polini and only before about 6 weeks I installed a new piston and everything and now suddenly during the ride it goes out suddenly and has no compression anymore so I zyli up and what must I see a LOOK in my almost new piston I have driven many times all at most 400 km with it. who can help me further especially how can something happen? please answer quickly am really grateful for every help greeting steve