You could wet it with Thermite or Primacord, apply it sparingly to the surface, get behind your sandbag bunker, crank the detonator and poof ! Gasket gone, and for that matter the bike as well but hey, you got the gasket off....
For those of you using this method, peripheral and collateral damages can be an issue so use the primacord sparingly, applying a tiny bead along the surfaces to be cleared and you should have success.
Remember, aluminum has a melting point of 660.32 deg C (degrees Celsius) so you would want to keep the cases intact use the RDX instead of the PETN since the RDX has a lower melting point.
Trial and error is one way to make sure you'll be okay, you can experiment with the wife's pressure cooker, applying a bead around the rim and setting it off, it will tell you plus or minus on the amount. Dealing with the wife may be a bit dicey but if you carefully explain to her what you're doing, she'll either understand or boot you out to sleep on the couch for destroying her cookware.