HI, I HAVE A 3 CYL. 1989 70HP EVINRUDE, WITH THE ENGINE WARMED AND THE PLUGS OUT, THE COMPRESSION WAS APPROXIMATELY 100 PSI IN ALL CYL. DOES ANYONE KNOW WHAT THE NORMAL RANGE IS (IS THIS LOW)AND WILL I EXPECT TO REBUILD THIS SOON? I WAS TOLD THAT 120-140 PSI IS OPTIMAL AND AT AROUND 100PSI IT...