stand er up

i was not ragging on it either just driving along!!!!my mechanic said i probally "cooked" the rings?or the piston?no compression on left side of engine now!

i bought a 2003 banshee,new crank,bored .040 over and weisco prolites,heres my problem is when i took it out for a ride,it worked fine for most of the day, had my gf and i on it for a ride and at the end of the day we were on our way home and it started missing on the right hand side and got super hot!!!!!also made poppin/chuffung sounds out of pipe? what happened?i am a first time banshee/2 stroke owner by the way.