Diagnosing an engine and retuning a carb?

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See how its black and how you can see it's oily that would indicate it is rich and you pulled it out recently after using it.
wipe that boy off.

now that you have a 1 Gallon can which is good get a 1 US Gallon Of Gas and Pour In 4 Us Ounces of Oil and Shake the Can
 
Looks like you were putting in 2L worth of oil but only 1L of fuel. Blow or wipe the oil off your plug, mix up a fresh can of fuel and try again.
I did 32:1 so 2oz for 64oz. Really I had 60oz of gas so I did 1.75oz
 
So, I bumped the needle back to the second position. Four mile ride, I think it's looking better. I made holes in the air filter. Noticable difference. The pin in my throttle fell out so I made one that's works even better.
 

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