Cylinder Rust. Possible clean up?

[jrblanke]

Boy, what a disappointment. I pulled the heads and it looks like the rear cylinder has some rust in 2 cylinders. I really didn't want to take apart the bottom end.

My questions are

1. What is the best way to clean this up. Can I use some evaporust or phosporic acid to wipe the rust off? If I did this, I would not want to pull the piston.

2. If I pull the crank and pistons, can I hone the cylinder with a ball hone, put in new rings, and put the original piston back in?


Here are the pictures:

The first picture shows before I wiped it out.
The second picture shows after I wiped it for 30 seconds with WD-40 and a t-shirt.