i have a 1978 johnson 200 and i took it out for the first time this year and it was running ok nut after a few minutes it was running a little rough.I thought it might be the fuel pumps so i brought it in.Compression was a little low so the mechanic was going to change the seals or rings not sure which one.but anyway when he opened it up he said it was a cracked block.but i am puzzled because the compression was only a little low.dont remember the compression but he said there off by a little.he then offered to sell me another motor right away.not sure if hes telling the truth or is he just trying to sell me another motor.