rebuild gone somewhat wrong need help!!!

[soberinphoenix77]

so i had to rebuild half of my top end because i fried the valves (long story) anyways when i unmounted my 157qmj motor i guess i disconnected a ground wire that comes from the grounding terminal so when i tried to start it it would not fire and the wires heated up and started smoking some. there doesn't seem to be any damage but i need to know where this ground hooks to so i can get my scoot on the road again asap