Ok I know I had post is a little old from when I started it but just giving heads up just in case anybody else runs into this problem. After I cleaned carb the quad was running good but started to loose power again taking off till it finally wouldn't take off anymore. Turns out the roller weights to clutch was worn and the plastic around it broke and was causing the clutch to stay on the high gear so wouldn't take off. I removed the 2 weights that were broken and worn out and now it's popping wheelies when I take off. But of course no top end. Lol I already ordered the roller weights and rear spring so my daughter is happy now. Thanks everyone for all your help.