Hi I purchased from a neighbor, a nice looking Yamaha 9.9 longshaft 1992 model. The motor stat for 7 years and was locked up. After using a can or kroil and three days of soaking. I have broke the power head loose and got it to turn, but it is stiff. Hopefully the penetrating oil will loosen it up with time. Should I spin the motor to help this? The lower unit is frozen to the power head, but works. After cleaning the carburetor I will attempt to start it. Any suggestions to aid me in this? Thanks.....Robert