I got a 2006 Agility 50 that had not been run in about two years. It had no key so I had to rig up a jumper to simulate the ignition switch. I first it would crank but not fire up. I then cleaned out the fuel tank, removed and cleaned the carb., replaced the spark plug, changed the oil, and put a good battery in it. Now it fires up and idles just fine. The problem is the as soon as I open the throttle, even when the engine is warm, it dies immediately. The only thing I didn't dismantle and clean on the carb. was the accelerator pump( I forgot to do this and didn't remember until I had it reinstalled). Could this be the source of the problem or is there something else I overlooked?