I have a 2005 cr125 new to me. I had millennium tech replate cylinder and supply new piston. I replaced crank bearings and now it won't hit power ban. It feels like a 4 stroke bouncing off rev limiter. It is also putting a lot of black spooge out of exhaust i mean a lot. The plug is black. I cleaned carb and adjusted floats. I also repacked silencer. I noticed the carb leaking gas out overflow the other day. I suspect it is running really rich. I have a brand new pwk from Jd jetting I'm going to try out. I also did a leakdown test and it held. I also am not 100% sure the power valve is set up right. The manual doesn't go into great detail about this. But it seems like there is only one way to put it back together. I have the engine out I'm going to do another leakdown test and double check my power valve and put it back together with this pwk. Any other thoughts out there?