Re: 9r72 low compression bottom cyl Home › Forum › Ask A Member › 9r72 low compression bottom cyl › Re: 9r72 low compression bottom cyl MumblesReplies: 5764Topics: 298 October 24, 2018 at 3:33 pm #84923 Since the motor was seized, there might be rust on the cylinders and rings. This rust must be removed as it can cause severe wear to the pistons and cylinder walls when the motor is started. You might consider doing a complete teardown.