Tippie said:I would be trying the heat gun option, failing that a thin blade through the gasket. I have never needed to use gasket gunk on base gaskets on a twin but some people never assemble anything without it.
Not necessary to use sealing compound, unless you're re-using a broken gasket in the middle of the Atacama desert... nah, Laverdas don't break down.
At most, I use a thin smear of grease to aid future removal. Weeps a bit until surplus grease has escaped, but is as oil tight as installed dry.
piet