Ok, my bike ran perfectly, then I put on a noss head with 21cc domes. I put it back together perfectly and now it doesn't idle. Put in fresh gas and new plugs, same problem. I know everyone might say its a jetting or carb problem, but NOTHING has changed on them. Basically it worked one day and not the next and I didnt even ride it. It fires up on 1 kick and it runs fine if you hold the trottle like half way in. Its like the first half of the throttle doesnt exist. When you let off the gas, it just dies, no sputtering. So WTF could be the problem? Please help, thanks!