I have a 1994 FourWinns Sundowner buddy cabin with an OMC Cobra Stern Drive. I live in the mountains and prior to winter, everything was running just fine. I winterized the boat and put it away. I just took it out for summer and everything started up just fine, however, when I tried to test the drive, the propellor would not spin in forward or reverse. The linkage is in place and is operating, I can see it moving into position. I did notice it was hard to push the selector forward and in reverse. Can someone tell me what might have happened over the winter that would cause this?