Part of rebuilding any engine usually includes careful inspection of the crankshaft/con-rod/piston assembly and replacing any parts that are worn or damaged.
This will restore full performance, reduce oil consumption and lead to a smoother and quieter engine if carried out in conjunction with a valve train overhaul.
Other related components you may wish to consider:
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Engine work to carry out? Try this pro-workshop Gasket sealant 08CRAHLG120G; easy to apply and with excellent results!
This component may have other applications within the Kawasaki model range, so please make sure you order the correct part number for your application.