Part of the process of rebuilding the engine usually includes close inspection of the crankshaft, bearings, con-rod, piston & piston rings and cylinder bore, replacing worn or damaged parts.
This attention to detail will bring performance levels back to where they should be, as long as the valve-gear and camshaft drive train is in good condition?
Other related components you may wish to add to your shopping cart at the same time:
Don't forget to order all the gaskets 5RU11181005RU11193005RU1135100 and new piston-pin circlips 9345022027 (just a few examples of parts you may wish to order) required in one economical shipment.
Pro-workshop gasket sealant, 08C70K0234M - to complete the job like a professional.
Please be aware that this component may have other applications within the Yamaha model range; so do check the part-numbers ordered are correct for your model.