you had said in a previous thread right before X-mas that you had it running/idling, but as soon as you gave it throttle, it would die out, and then it would just kick back when you tried to start it again after that.
http://www.kxriders.com/forums/index.php/topic,12317.0.htmlThat "could" be a sheared flywheel key causing the kickbacks.
I just went through the same thing after installing a bigger brand new carb....I had to fatten up the pilot to get it to go above idle...once that was done it ran great, but fell flat on it's face in the upper revs....so I had to fatten up the main...now it has power all throughout....but, I still have a lot of fine tuning to do, and the weather is not ideal here for testing...15 degrees for high temps and we're expecting a ft of snow tomorrow and Friday, so I don't know when I'll get back to it.
I should also point out that mine was a COMPLETE rebuild....I'm actually embarrassed to say how much I spent this time.....and mine was a bitch to get started the 1st time, most likely from all the oil that was in the cylinder from assembly....it took 10-12 hard kicks.