I finally checked the spark and compression myself. The good news is that I have great spark, and great compression on 3 of 4 cylinders. The bad news is obviously that I have weak compression on 1 cyclinder.
*around 115 on 3 good cylinders -- 80 on the not so good cyclinder*
The previous owner mentioned that he had some overheating problems in the past. It looks like the head gasket might have leaked. It sure would be great if I could get away with just replacing the head gasket. The plug in that cyclinder looked the same as the others -- black/wet with oil.
What would a shop normally charge to replace one head gasket? What would they normally charge to install a new ring? How hard is it to install the gasket and ring (I am waiting on my manual).
Should I try running SeaFoam in that cylinder since this motor runs very well on the muffs?