There are many variations in platings, and if you were to use the platers I use, it runs 204.95/cyl, if no other operations, such as boring, are required. If sealing surfaces need to be repaired, it runs $36/cyl, and if other repairs are required, you're going skyward. I was having a discussion with a dirt bike shop owner about nikasil and he informed me that most stock bike cylinders have a sprayed on coating that is honed, kind of like porsche's early flame spray cast iron coating for aluminum cylinders (ala p356, 547) If one were to do it in europe, it runs about 50% less than here in the states, but there is not concern about high sulfur fuel, etc, and warranty converages vary too. One company in the states offers a one year warranty, where my plater gives a lifetime warranty. Coating cast iron will get you a slight reduction in friction, and in something like a stockish application, near infinate cylinder wear. Expensive for cheap cast iron cylinder tho....
Charles Navarro
LN Engineering
http://www.LNengineering.com
Aircooled Precision Performance