MOPED ARMY

there are a couple of different carbide bits available. they do make it easier, but honestly just get a coarse round file, a fine round file, a coarse square file, and a fine square file. the dremel makes it faster, but you can do it alot cleaner with the files.

I used a Dremel diamond tipped bit. I also used part of a spray paint can to protect the other side of the cylinder when using a file. Riffling files are kind of hard to find, but show up in flea markets a lot.

by intake ports inside the cylinder do you mean the transfers? or the intake port window?

Start off marking the inside with a red sharpie marker.

Otherwise its really hard to gauge how much you cut!

I have always used the same mini die grinder with the same set of Matco carbides.

that's what she said.

Seriously though, I use a dremel and cheap ass home depot bits for all my port work. Just clean up the edges with a hand file and sand paper. I don't neccesarily do shot right most the time though.