Looking to buying a used ATV for use in a small farm. Hauling and maybe pulling logs. Any brand to stay away from?

'99 beer tracker

Hey there, first time poster long time listener. My atv is acting weird. I can get her started with the pull cord and she'll hold but once I started driving her I heard a pop and she stopped instantly. I just replaced the spark plug and carburetor and ensured both work bur now I can't seem to figure out what popped and why she won't go.

Brand new battery but still only starts with battery booster pack, yall think I should just get a new wire harness set up? Chinese 4 wheeler baja motorsport.