Did you run a bottle hone before the ring install? Maybe pull a valve cover and see how far your valves are opening too and make sure you don't have flat cam lobes. If you get fully stumped I would try to get an air chuck that threads in to your spark plug hole. Make sure the cylinder is at TDC on the compression stroke, find a way to keep cylinder from moving so the air pressure dose not push piston back down and put some air to the cylinder. You want to open the throttle wide open and listen to you intake and then listen to the exhaust and make sure no air leaks past your valves. You will hear a little air leak in the crank case due to the rings having a gap. Try to see if it is all leaking past the rings or if is leaking some were it is not suppose to. You don't need to put a lot of pressure to it so if you have an inline regulator you can start with a low pressure and slowly turn up tell you can hear were it is coming from clearly would be best.
