When overhauling the engine, replacing as many of the wear items as possible will simplify the reassembly and subsequent adjustments required to set up the unit correctly. Some of the most vital items include valve guides, valves, valve springs and these PISTON RINGS - these will improve performance, reduce oil consumption and help achieve a smooth, quiet running engine.
These are the second oversize (+0.50) items.
Check out this related part you may wish to renew at the same time:
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