New images. I hope cleaning cylinder save us .

http://s29.postimg.org/71grxk79z/IMG...4_WA0016_1.jpg

http://s22.postimg.org/86n54r2hd/IMG...4_WA0019_1.jpg

http://s9.postimg.org/fjlg7hh1r/IMG_...4_WA0017_1.jpg

http://s21.postimg.org/6ki6vqhzb/IMG...4_WA0020_1.jpg

http://s3.postimg.org/jpvu8sj9v/IMG_...4_WA0022_1.jpg

Any pictures of the piston dome (including underside)?

With the pictures of the piston it does look like some scoring. Can you feel these marks with a finger nail?

I asked to my friend. He tells that he can feel 1 scretch on cylinder under side after cleaning.

It looks like it's been hot a few times, and it's seen a bit of dirt of the years. I would just measure the cylinder bore, order the correct oversize piston if it even needs one, clean up the power valve and put it back together. If you're super worried about it, send off the cylinder to be replated. I've run cylinders for years and years that looked much worse than that.

I agree, the cylinder looks serviceable.