Re: Bogging at top end
The box with the spark plug wire is your CDI, or ignition module. The wire is okay to use but you should replace the part that connects to the spark plug. That is called a 'boot'. You can get a good automotive quality one at any auto parts store. Also replace the kit spark plug with a better plug. Many of us prefer the NGK B-6 plug.
When you ran the carb cleaner through did you mix it with your fuel or just spray into the carb? I'd be careful running it in your fuel. Too much and you might dilute the oil enough to reduce its lubricating properties.
You said the engine is "a few years old". Did you build or buy this bike from another person?
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"