But keep in mind that the power torque engine is very forgiving as far as tollerances and imperfections go.

The bore would have to be pretty horrendous to not be able to bring it back to the point where you could not make a running mower out of it.

Two things stop you from doing so. Honesty and longevity so far as someone like myself.
For a guy in his garage with his own mower the only issue would be longevity and performance. Both would be compromised to a certain extent.