I've been ridin bikes for 15 years. I recently bought an 06 RMZ 250. My first 4t, been a 2t guy. The kid i bought it from said it needed carb work, so i cleaned the carb, put it back on and it did the same thing (wouldnt idle with choke off). So I dug a little deeper to find that the valves needed shimmed and needed a new timing chain and tensioner. Got all that put on. Runs great now except for the fact that it really backfires on decel. So i bought a JD jet kit for it, man its really comin to life!! BUT STILL POPPING ON DECELERATION. Is this a bad thing or am i making a mountain out of a mole hill?