Hi and thanks for using 2CarPros.com.
If the engine is running, the timing must be okay. A lack of power can be the result of several things. Take a look through this link. It discusses may common causes why a vehicle may have low power.
If nothing there is helpful, check engine compression. That can help diagnose timing issues, low compression. I realize you replaced rings, but that does not mean there is a problem with the valves or a head gasket issue (even though it is new).
I have to apologize in advance. This vehicle is not offered in the US, so I have no technical information specific to it. However, they all work the same, so check out the link and compression if needed.
Let me know what you find or if you have other questions.
Thursday, October 11th, 2018 AT 6:10 PM