if there's any critical part of a bike besides the engine stuff, it's a rear wheel. it helps to stop, cushions most of your weight, stands up to engine torque and does all the miles you ride. also wears out quicker. put a good wheel n tire on or build a wheel. not really hard. tons of vids out there.
to me it's upgrade brakes then rear wheel for first priorities, if everything starts out stock.
I have a Hyper too but didn't build it yet bcs i think _everything_ on it wont hold up to a motor