So hello everyone I'm new to the forum and to the craft of building motorized bikes. I have already chosen the cruiser I will be using, however I'm having hard time deciding on what motor to get. I'm stuck between the PK-80, black stallion, flying horse, or jet. Anyone have any ideas which would be easiest to upgrade and provides the most kick for stock? ANY help is appreciated, i've been reading for hours and can't seem to come to a conclusion. Thanks