Hello all, been slowly working on my 2003 Cr 125 that I bought from my buddy. All new plastics, seat cover, jetting from pro circuit specs, carb clean and needle adjusted, new air filter, new crank seals, a work in progress.
I've got it to the point where it fires right up and runs and idles, but there is an excessive amount of smoke. A little more than normal, enough to be concerning. Also, while running, the top end sounds like a "knock" in the top end, i've read these are noisy motors but it doesn't sound too right. I did a compression test which read about 125 psi. Is it time for a new piston and rings? Also what could the knocking be from? Thanks!