The crankshaft and piston/cylinder-barrel assembly have to be perfect for the engine to give its best. At the very least (and if you are lucky) just a new set of piston rings may be all that is required. If the wear is more serious then you may wish to consider the related components listed below:
Add as many components as you wish to the same shopping cart, new fasteners, seals and gaskets for example, and still only pay the same single fixed price shipping cost.