I have a 1990 Force 150. I find it odd that when I pull the lower unit towards me it moves about an inch as well as the upper unit (the motor) moves. I notced there are large rubber pieces mounted at the top and bottom which appear to be there to absorb shock. Is this movement normal or do I have a serious problem. If so what is it? This is one of two engines and they both do it. Please help. GaryD