Bike will not stay on, i'm about to lose it

If its not one thing it's another, first the chain, now the bike wont stay on long enough to move 5 yards im going crazy please help what should i do to make this bike move

How olds the fuel mixture? I would check for a air leak around the intake area by starting it up and spray some carb cleaner around the intake area but not into the airfilter. If the rev's change you have a air leak and need to replace the gaskets. You may just need to clean the carb too.

fresh gas mix it up yesterday,

and black stuff oil-gas I dont know is coming out of the pipe y is that

too much oil in the mix too rich lean it out a bit but not too much!!! u will always get something coming outta there its a two stroke.......