In addition to what Ron said, here is the skinny on what a ridge is. As the piston travels up and down the cylinder bore, it starts to wear and the bore starts to wear. A properly fitted piston and rings will allow the piston itself to actually "float", and the only metal -to-metal contact is the rings with the bore. You may have heard the term "piston slap", that is where there is too much clearance between the bore and the rings (or also a worn wrist pin).
There is an areas of the bore (sleeve) that the rings do not rub against, because it is at the top of the bore beyond where the rings travel. After hours of running, a small "step" or ridge will form because the area the rings travel in has worn down a bit. There are specific tolerances for how much wear is acceptable (which is why they make + .002 rings). There is a ridge reamer tool that will cut the ridge out. This is important because not only do rings wear around the circumference, they also were on the sides (top and bottom). When you install new rings, if you haven't removed the ridge, you run a big risk of breaking the rings when you first run the engine after rebuild. This is because a new ring is full-width, and at the top of the stroke will hit the ridge, thus breaking the ring.
Honing a cylinder is nothing more that smoothing it up, and also making small "scratches" in the cylinder walls. Properly done, this is known as cross-hatching. Cross hatching is VERY important to allow the new rings to wear in and "seat".
Feel free to keep asking questions, that is how you learn. That is also what this board is here for. For people who "know" to share that with people who "don't".
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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