777__banshee__777

i have a 1989 yamaha banshee i bought it with a blown top end and it was siting on the guys farm for about 12 years in a barn i did a top to bootm rebuild on it i but new 80 over cylinders on it with new wisceo forged pistons i put a choriot 2-1 carb kit on it k&n air filter new stator new wiring new cdi new coils newclutch new rad new power reeds fmfs all the way back it was running good when i was doing the first heat cycle but then the magneto got lose and it looks like it scratched up the new startor and the thing that catchs the time of fire and new it starts first kick but deads after 3-7 seconds what do u thing i should do?