I have a 1973 50hp Evinrude. Top cyl has 100psi and the bottom cyl has 130 psi. The motor was left sitting for a long time and had seized up. I was able to get it freed up, but now have low comp in the one cyl.....When I got the motor the head cover was pulled, but not the head. I have replaced coils due to no fire and later found that it was a bad power pack which I will be receiving tom.... The head cover gasket seems to be damaged..... Could this be the cause of my low compression??? Or maybe a stuck ring....? Kind of at a loss on what to do at this point. Any help and/or advice would be much appreciated... Have already rebuilt carbs and replaced fuel pump/lines etc.... Have invested too much money to just give up on it, but dont have the money to rebuild it at this point either..... Many thanks....