you have seized it up mate,that was the noise you heard screaming.it will normally do it a few times if you keep riding it but you will notice it goes again after a few minutes when the piston has cooled down and loosens up in the barrel,you have a problem with the oil getting into the crankcase and/ or a cooling problem .is the bike water cooled or air cooled and have you got plenty of 2 stroke oil in the bottle? let me know these questions and ill help you more ok ,adam
adam bike doctor, March 2006