The piston takes the pressure of the burning mixture and transmits the force through the pin to the connecting rod; this item is sold without rings. The 47.00 mm size is the cylinder bore.
It should be replaced if it is scored or burnt, the clearance in the cylinder has increased, or compression is lost. Choose by the cylinder diameter given in the name; the rings are bought separately. Not sure whether the part will fit? Call the store and we will help you choose for your model.
