Rebuilding an engine completely inevitably includes new pistons, crank-shaft/con-rod (little and big-end) bearings and a host of other small parts that are better replaced than reused; piston-pin, circlips, con-rod bolts (which should always be replaced to allow the correct torque to be applied when tightening).
In short, this is a task for skilled mechanics; but one thing for sure, the more components you can afford to replace the better the results.
Of course, you may be lucky, and only need new piston rings, either way you may wish to consider these other related components listed below:
130011113
130291061
130085059
130255025
130315005
130311053
132511051JJ
132511006HH
132511006II
920011120
92001169
920281049
920281050
92038001
Add as many components as you wish to the same shopping cart, new piston-pins 13002032 piston pin circlips 92036005 and nuts 920151311 for example, and still only pay the same single fixed price shipping cost. Pro-workshop gasket sealant 08C70K0234M to complete the job like a professional. This component may have other applications within the Kawasaki model range.