There's also E-Bay.
I will try that. The gears on this one is a cable to a lever that pushes down on a rod at diff lengths for the gears. I just don't know which positions
Charge battery and then have it load tested, You said battery case was melted, Does it still hold water"electrolyte"
OK, so from the factory it's an 8hp?, but what I don't understand is that the same serial number comes up as a 9.9 too?
Take pictures before and during disassembly for reference,soak them overnight and be very thorough,take your time and clean every nook and cranny