Part of the process of rebuilding the engine usually includes close inspection of the crankshaft, bearings, con-rod, piston & piston rings and cylinder bore and replacing any of the worn or damaged components.
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.