Never tear down after only one test, you need to read them all and multiple times (3-4 at the very least) as compression testing has so many errors that come with the process. If you were not holding the throttle wide open for one, the test is meaningless. Need a good hot battery and all 4 plugs removed too. I use car battery, bike one runs down too quick. Your gauge quality can even mislead you easily, and so can the relief valve on it. A push to seal gauge is worthless there, need screw in to seal only.