DUDE THINK ABOUT IT
1 LOTS OF GAS ON SPARK PLUG
2 BACK PRESSURE COMMING THROUGH THE CARB
3 THE ONLY WAY YOUR GOING TO GET BACK PRESSURE IN THE CARB IS FROM A REED STUCK OPEN
(PULL THE CARB AND HAVE A LOOK)
THE REASON IT IS POPPING IS THAT THE IGN. IS WORKING THE BACK PRESSURE IS NOT IN THE CRANK CASE
ITS GOING THROUGH THE CARB