Removing powder-coat can be a bit of a pain, and once you start there is no going back. The black engine coating is very thick because it covers some really crappy looking aluminum.
I went to Menards and used their paint stripper that comes with a pump sprayer, I am not near my home so I cannot tell you the name. I then started wet sanding with 320 going up to 1200. Then I used the polishing wheel. If you get a polishing wheel, be careful because you will want to polish everything! My primary cover had a leak and since it was off anyway I went ahead and did it.