There are some posts on the previous pages describing the break-in made by several people (including me). Some did the four stroking method some used the break-in bench, what we found is those engines run apparently hotter than Nova and others due their different cooling head and the combustion chamber height needs to be raised before using it.

Check it with the solder wire method (measure the crushed part of the solder wire and tell us what height you have and which fuel you plan to use with it before grenading it).