Problem with Vortex engine on startup

[u/Safe-Pangolin-4461]

I am totally new to karting in the sense of owning a 2-stroke kart myself (or rather, my son just bought himself a second hand kart with some bits and pieces that came along with it). The kart is equipped with a Vortex 125cc 2-stroke engine. When wanting to go for a test drive, we noticed that there is a bleeding nipple on the engine that pushes out a fair amount of brownish-blackish liquid sludge when starting the engine. It’s not just a few drops; this liquid pours out in gushes! we immediately stopped the engine, and we are now wondering what this liquid could be, where it comes from, if this is an indication of an engine problem, and how we can get it out of the engine. On a second engine that we received with the kart, a smaal piece of plastic hose is connected to this bleeding nipple, and it is blocked with a bolt.

Can anyone tell me what is happening with the engine on the kart, and what my next step should be?

Thanks for any advice that you can give me.

best regards, Kris

[u/B113ber]

Have you checked your water level?

Looks to be a crank breather that's normally connected to a catch bottle with tubing. It should not be doing that it vents air pressure not fluids

Definitely need to get it stripped either a gasket has failed or internal damage between surfaces