Yesterday put it on reserve just in case but would not start and this is with a brand new Mikuni .
Decided to fit one of the supplied bigger pilot jets. Just as well I did as like Tonups mower, it looked like hangover pee in the float bowl.
Tried it straight from the tank and not on reserve - crystal - Wunderbar - second kick.
So I'm thinking the water/mouldy fuel has sunk to the bottom of the tank.
Something to ponder perhaps for the next time you are running low on fuel after a long layup.