I cleaned mine a couple of times. After the first time they looked like this:
Don't have any pics of the exhaust, transfers or the 2nd time I cleaned them up.
I did mine with hand files, took me oo a day to clean them up the first time, put the bike together and run it. Like the little power increase it gave me and so the next day I tore her down again and cleaned them up more. "knifed" the bridge on the intakes more, and opened the intakes by oh 2mm probably. Opened the exhaust a little bit and smoothed that out, and knifed the transfer bridges.
After I got it back together the 2nd time there was more power again, but obviously not near as much as an actual port by a pro. I noticed more mid-top pull, higher RPM, quicker RPM gain and yea better pull,lol.
I did however take material away from the sleeves. But even still, if you make the intakes, transfers and exhaust flow better, you will notice something.