Basics of any rebuild is careful inspection of the crank/con-rod/piston assembly. Hopefully just a set of new piston rings will be enough to restore full performance. However, scoring on the piston and cylinder bore, or "gritty" rough bottom end bearings will require a little more attention.
More related components listed below:
Add as many new parts to the same shopping cart as you wish, new high-performance big-bore kits 01050421 (12PS) 01050423 (14PS) for example, and still only pay the same single fixed price shipping cost.
Please be aware that this component may have other applications within the Honda model range, so check the part-numbers you order are correct for your model and application.
Pro workshop gasket sealant 08CRAHLG120G - easy to apply with professional results.