When the brand new bikes were taken out of their crates, set up persons were supposed to drain the trans/clutch area of every 2 stroke bike.
The gear cases were filled with a preservative, referred to as "Pickling Fluid" a fish based oil that stopped rust and other issues as the bikes sat in their crates. If rust had formed on gearbox parts, gear teeth, that rust could compromise the gear tooth faces, causing pitting, which could have resulted in gear tooth cracking, and/or failure. The fish oil isn't meant to be a lubricant for the gearbox/clutch, only a preservative.
I used to have a few Kawasaki dealerships in So. Cal., save me all the pickling fluids out of new bikes, which I used on all sorts of things to preserve them, like rebuilt cranks, cylinders, heads, carbs, gearbox parts, etc.
Only times I have ever seen gear oils do what it has done in these pictures, is when the gear oil was very low quality. Also, clutch friction materials usually help cause any fluid used in gear boxes get like that, but, not as bad as in the pictures. Gear to gear friction also causes the oil to degrade through molecular sheer.
I've seem a handful of transmission/clutch areas almost as bad as this one, but, it didn't matter the oil used, even one that had Bel-Ray synthetic 'gear saver' lube in it. This crud/goo doesn't cause any trouble I've ever seen, just hard to clean up.
Most of the spray carburetor cleaners will have a positive effect on removing this goo, without harming the aluminum.
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It has stained everything virtually beyond cleaning, there are globules of oil, like mini balls of chewing gum on every part that protruded above the oil level, the residue of oil in the crankcase was just pure sludge, everything is salvageable and useable but its all just so stained 
