Manjisann, you would be surprised how many cb650's i've opened up with 30,000+ miles on them that were within specs before needing bored bigger or anything.
Let alone how many of those I have stuffed the stocker pistons and rings back into them.
If anything mabey use a ball hone to re-establish your cross hatch.
wow, yet another SLC 650 rider.
Thats me, you, ghost, mosiquitojones.
We should try to get a 650 ride through the canyons going one of these weekends.
l8r