Well, do not worry too much. These motors have an automatic decompression system that can cause a low reading on a compression test. When testing the compression you need to push the throttle all the way to the floor and hold it there while cranking, which in most cases raises the cranking rpms enough to deactivate the decompression mechanism. If the battery is a little weak, throw a charger on it first for a while to make sure there is enough voltage to crank it over fast.
2006 Rhino SE, Dynatek CDI, Loony Tuned Dual Exhaust, Funk Custom Intake, Keihin FCR, SoCal Fab Long Travel, Baja Cross Tires