My sons 66cc/80cc HT bike was running fine. Today, at or near to full throttle, it runs for a second or two, the engine loses almost all power for a second or two, power comes back for a second or two, rinse and repeat. I replaced the cheesy stock plug cap with a nice NGK cap, thinking it might be loose, but that didn't help. I moved the carb needle down a notch from middle where it had been, up a notch from middle, no difference. Maybe a CDI about to go BP on me?