LOUD backfire

[Keats]

ok i just rebuilt my engine, ran great. I forgot to tighten the nut that holds the magneto/flywheel to the crankshaft to 94 ft/lbs. the hex key snapped, so i replaced it. then i tried to start it, all i got was an extremely loud pop/backfire. I tried it again, same thing. Whats goin on?? it's really pissin me off now....

[killa03ex]

Check your plug. mine backfired LOUD when I tried starting it one time.. come to find out it was my plug was fouled because of how rich my jetting was

[ImplodedMindZ]

Possibly out of time?