Bore out the cylinder in a honda cadet motor?.....mate - highly illegal!!!.....but re-honing is allowed......and if so there is a trick to getting it perfect, which I'm obviously not going to reveal ;-)
But yes, I have also heard of people boring out in TKM and the old 100cc days to get the max piston size, but ideally you should used an old barrel that has been heat cycled to hell and back, which is now settled and stress relieved.......not a new barrel.
Hondas are a fickle design where they have a thin-wall steel/iron liner over-cast into an aluminium high-pressure-die-cast (HPDC) cylinder block, and when it heats up the ali expands twice the amount of the steel liner and it all distorts.......messy.
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