just putting my bike back together and i put the magneto on and when i started it up it ran great and for about 30 seconds then it started backfireing so i checked the magneto the key shredded, I then got a new key and now it starts but it just bogs down after I rev the engine I have no chain on, I just put new plug reeds and cleaned the carb out. when I installed the new key I took of the stator and was thinking that the timing was of, i tried ajusting that, I am getting pissed please help me out it starts up right away and idles fine just when hitting the throttle does it boog out I can slowly increase the throttle and get some type of responce but not much, its a two stroke KX 250

 

nobody?