I used heavy doses of WD-40 in my engine to clean it and didn't have to disassemble. It was pretty gooey like yours looks. I don't think the WD-40 has much of lubricating properies for your engine so I wouldn't turn the crank any more than necessary. Dump the WD when the junk dissolves and reapply if needed. I'd chase it with lots of fuel and turn the crank. Dump the fuel out and chase it with your choice of afterrun oil, tranny fluid or whatever you prefer to keep it from corrosion.