OEM paper cyl base gasket

[xlfan]

Has anyone got a magic formula for a liquid that can dissolve this base gasket besides harsh mechanical removal with the risk of damaging the cylinder base gasket surface?

[rigidthumper]

Sometimes you can soak them in Knock'er Loose and then scrape with a plastic blade.
Sometimes it's easy, sometimes you wanna buy a lathe so you can machine that stuff off  .
(I bought the lathe)

[SP33DY]

I tried a few things that didn't work!

 Now when I get an Evo cylinder with baked on gaskets, I use a mandrel to hold the cylinder in the lathe and carefully skim it off. Often when I do this I find out that the base is no longer flat. There are areas that didn't "clean-up" once the gasket is mostly gone. It usually only takes a skim of a few thousandths of an inch to restore the whole base to flat. It's faster to do it this way than with the old Trock lapping plate. Going back together, I like to install oil drain pigtails (V-Twin 16-0912). To tap the drain hole I use a spiral flute "drill tap" (McMaster Carr 3464A21 or 2748A47). The drill tap is a close fit in the hole so the tapping operation is straight.

drill tap 1

drill tap 2

[SixShooter14]

I tried a few things that didn't work!

 Now when I get an Evo cylinder with baked on gaskets, I use a mandrel to hold the cylinder in the lathe and carefully skim it off. Often when I do this I find out that the base is no longer flat. There are areas that didn't "clean-up" once the gasket is mostly gone. It usually only takes a skim of a few thousandths of an inch to restore the whole base to flat. It's faster to do it this way than with the old Trock lapping plate. Going back together, I like to install oil drain pigtails (V-Twin 16-0912). To tap the drain hole I use a spiral flute "drill tap" (McMaster Carr 3464A21 or 2748A47). The drill tap is a close fit in the hole so the tapping operation is straight.

drill tap 1

drill tap 2

Exactly how I did it after a few days of wrestling with plastic razor blade scrapers and carb cleaner, it went on the lathe.

[xlfan]

I tried a few things that didn't work!

 Now when I get an Evo cylinder with baked on gaskets, I use a mandrel to hold the cylinder in the lathe and carefully skim it off.

Got a picture of that mandrel?

[SP33DY]

Here's a link that shows what I use now. It goes between centers.

Mandrel

I don't think I paid that much, I found a whole set that went from 1/2" to something over 4" a long time ago. Prior to that I held the head end of the cylinder in the headstock chuck and supported the base end with a rotating 3MT chuck in the tail stock. Here's a link to that.

Chuck

I didn't like expanding the jaws inside the base spigot, I was worried about distorting or cracking it. That's why I switched to using the mandrel.

[jsachs1]

I use a 6 jaw chuck, and made an angle/taper aluminium slug in the rear/id of the cylinder with a true flat area to indicate off of and center hole. I use this with a dial indicator on a live tailstock. 100 % accuracy. Love the mandrel, but way out of my price league.
John