Hi go-rebels,
Wide-open throttle and motor turned briskly should range from 80 pounds [stock] to 165 pounds [not stock]. The numbers will vary depending on the stage of break-in your motor has achieved. I would suspect you should see numbers above 110 pounds with a similar motor.
It is important that I explain the term "briskly" in more detail......... with bike on stand, and serious pedal movement with the throttle wide open. The pedals should at least make 3 swift complete revolutions. Or simply connect a belt from an electric motor [like the one attached to my shop floor] and let the power company supply the needed "muscle"
Possible causes of low compression would most likely be head gasket or valve problems.
A possible detail to consider is the clearance between the head and the valves. It isn't always the same on new edition Whizzer motors. The height of the head of each valve can vary greatly from motor to motor, and depends on how centered the valve seats are in respect to the valve guides. I have only witnessed a few that were in "center", and the vast majority were off. If the seat is in center the valve seat doesn't require as deep of a cut. In other words some valves sit much higher in the cylinder and therefore reduce the area between the valve and the top of the head.
If the compression checks low, a quick look inside the head would be my suggestion.
Just give me a call, and I will supply solutions and answers.
Have fun,