Looks like street tar. They must of stored it with a full tank of gas.
The gas evaporated and left the oil mix, which dried in a mess about 1/2 inch thick.
I'm using a solvent and sheetrock screws to shake around inside to remove it.
The screws work better on rust but what the hack, it's worth a try.
At least there is no rust inside, it never had a chance.
Going to take it one part at a time; next will be the carb.
On another note I read on one of the post that there was someone that was selling handle grips.
If so I could use that info, the ones on the bike need to be replaced.
Cheers