Exhaust Bought new exhaust lost power!

It looks like it's rich, as in too big of jet. If you put a new pipe, it should have run leaner. Unless it was just a wanna-be pipe, got a picture?
 
Here is a update on that plug
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I'm having a hard time understanding the logic in this thread xD He said he bought a new EXHAUST and the bike got slower... Why hasn't anyone asked him to show this new exhaust? It is probably utter crap and thus the reason for his power loss. And this checking your mixture by looking at spark plug while engine is hot... What a way to over complicate things! This is not a Formula 1 engine we are dealing with here! Plenty of simple lean/rich instruction videos on youtube that will solve all problems that such a simple engine has.

Explain yourselves, people!
 
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