suzuki marauder vz 800?

Suzuki marauder vz 800?
I have the following problem: Bikes starts up fine idles fine but when I ride it there seems to be no power.
I have recently kreemed my gas tank due to rust, new air and oil filter installed. Even cleaned my rear carb, new spark plugs installed too. Am I missing something here as far as diagnostics? Front cylinder runs rich and rear one runs lean. I even changed my Jardine slash cut muffler back to stock ones.
Any "experts" have suggestions????? I am a good knowledgeable person when it comes to my bike and work on it very easily.
 
how do you know that a cylinder is rich or lean? are you just reading the spark plugs? Because to be exact you need to hook it up to an E.G.A. [exhaust gas analyzer ] at any rate without being there to see it I might Guess it could be as simple as a valve adjustment.
 
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