ok so i was out riding the other day i have just rebuild my top-end .50 over but i did not re jet the carb is that a thing you have to do cuz it wasnt running as great as it sould have.. also it cut of in the middle of ridding i took the spark plug out and found two aluminum balls jammed in the spark plug what is that from?? i thought i have messed up the piston and rings again but it still has really good compression. so help me plz.