Well as for the piston/liner, the conrod will generally not have to be changed for a long long time^^. The only part that needs to be replaced for sure is the rear bearing every 10 hours. The rest will depend on how you use and maintain your motor.

You state you took apart your motor, I hope you took great care while putting it together again. It's crucial that the head is tightened evenly on the case.

Nano