And again a new topic andagain not in the engine section..... You can use one of your P/S topics to go further with this question.
You have a Collari 35+ with a sleeve through the hole of the pistion pin ?
If so, you can use a needle to wip out the clip. If you have problems to pres out the pin you can use cleaning putty to lay the piston on and plase a 1.5mm hex driver through the open site of the pin to hammer out carefully the pin.
Speed is only fiction but a 130+km/h MRS4 is for real.