Thanks! Got some good advice. Already checked;

Cush drive is checked and okay. Wrapped in bicycle inner tube, ran 60K and still almost no wear. Will bring spare.
Water pump checked and all okay. No damage or wear.
Fluids: all replaced and circuits ok.

Will check;
Gearing oil pump (i guess connected to main engine like water pump)
Check crank nut.

As I have lots of time left, I will do grease/clean of all o-rings, gaskets and do a visual inspection of the engine's inside wear.
Will bring new clutch with me so we'll see how many kms I can still do on my old one.