I was under the impression you should never hone a NSR cylinder as they are plated and you could ruin them?

And I thought ball hones are never tobe used on ported cylinders since they can change the port shape as the balls pass by the openings?

Wouldn't a bar or flap hone work better?
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Andre E. Benguerel
1996 Honda NSR250R
Daijiro Kato/Fortuna Replica #74

2000 Honda RS250R (NX5)
2008 Honda RS250R (NXA)
AFM Expert #430