When you take the cylinder off anyway, I recommend that you change the timing chain (supposed to be done at 50.000 km) and the valve stem seals.
If your bike has not been consuming oil excessively it might work to only change the piston rings, otherwise have a rebore and oversize piston. Mind you, running in is also necessary with just new rings (first 500 km, engine speed below 4000, 500 - 1000 not above 5000 rpm, then oil change. During this first 1000 km, change engine speed and load frequently).
Succes!
Auke
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