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I completed the tests in order 1-4 and then ran the tests again. 1-4. I did add some oil to each cylinder to help seal the rings and not make them cycle dry. (lord knows how long this bike has sat). I will re-run the compression tests again today.

I picked up an ugly CB750 for Freeeeeeee. I started going through the motor checking spark and compression and came across something strange. Cyl 1,2,&4 all show 135-140. Cyl 3 shows 235+ psi compression. What could cause it? I pulled the valve cover to see if I could see if the exhaust...