On Monday, July 6, 2015 at 6:04:56 AM UTC-5, wrote:

Anyway, there's a 'spark suppressor' screen in the exhaust port. I
hit it with a propane torch. That ignites the wet stuff. After that
burns off, just brush the residue out, and good to go.

I would caution doing this...with fumes and mix in the crankcase? Not a good idea! *L*