Ok for what it's worth here it is.

" Okinox, the M22 is a real marvel of engineering and machining and is as beautiful on the inside as it is on the outside. That said, a few of the earlier models were supplied with slightly undersized pistons and rings of questionable quality which caused a low compression problem.

Several complaints from disatisfied customers forced Mintor to take a hard look at their operations and based on their findings they took the decision to suspend all manufacturing and restructure their operations with greater emphasis on processes and Quality Control. If you purchased your engine recently then I believe you have nothing to worry about. Much more information on the Mintor 22 is available from an on going discussion on the F***** **** site, so check it out."

Karol