Re: have REAL power loss now!
Forget about the spark plug thing. Lesson learned.
Let's get to the meat of the issue.
Engine starts easy?
Engine warms up nominally?
Bike has no low end power?
You wick it on and what happens?
Bike has no top end power?
Old Plug was black? After how long?
Your needle e-clip is where?
My guess right now is that you are running too rich, but that's just a guess. Need more info.