I need some help . I've got a 1992 ns90a with a dead #1 cylinder ( top cylinder ) .I can pull the plug wire and there is no change in the motor, but the other two cylinders have a very noticeable change.
The compression on #1 = 135 psi , #2 = 133 psi , #3 = 134 psi .
If I get the plug boot...
