Hi Carl. I’ve never had this happen, but if it did I’d be tempted to remove plug and spin engine over several times. Then a squirt of oil in cylinder, spin over again, clean plug and try to start and if it goes leave it running for a good time to throughly warm up. After stopping immediately open drain tap to let oil etc out. I’m thinking the sooner you get it running and oil circulated around, the less chance of internal corrosion. Charlie, I hasten to say, may well know better!
Stable doors and horses, but I put an empty dog food tin over all my SIMAR exhausts to stop water getting in when in storage.
Peter