I thought that Karl Snarl and I already taught you better than that...If your already broken in, you should have no less amount of oil than a 32:1 mix NOT 40:1...lol...lol.
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.
Your very first posting and your gonna antagonise and alienate fellow members with a very "snarky" line like that right out of the gate???...Not a very good first impression.