I have a 99cc predator engine with the governor removed it's new and I just installed it on my bike 2 days ago. When I tried to turn it on it will not turn on. When I applied the choke and full throttle and tried to turn it on flames shoot out the exhaust and makes a loud pop sound. I proceeded to drain the oil and check the timing on the cam and made sure the timing was right (two dots aligned on the gears). I checked for spark on the spark plug gets good spark. I made sure gas was flowing to the carb it was float bowl was full. I drained the gas from the carb and checked to make sure if the Jets were loose and they were not they were tight. The carb is new aftermarket from AGK. Killswitch is not connected to the motor and the rope pul loosing has been removed and I'm using a rope to pull start it. I checked if one of the valves on the head was loose and they were both on correctly as I spun the flywheel they loosened and tightened like they should. It still has not run I haven't checked the valve clearance yet and will buy a feeler gauge to do so maybe today. I do not know what else to check. Intake from carb is tight with no leaks. I'm using 87 gas, I tried no choke no throttle, choke no throttle, no choke half throtthle, no choke full throttle.