TheSilverFox

I am after a bit of advice and knowledge. Whilst running on a rolling road the piston rod jumped out of it's guides on one side. On inspection the joint connecting it to the rod has lost the plastic and metal joint fixing. This must have jumped off and will never be found again. The part number I think for this model with a modern motor and not the ring-field type is X8079. I do not have a clear instruction sheet. My question is how do I remove the driving wheel pin, Is it a precision fit? Any help appreciated.