Originally Posted by JohnZo

Lower compression on all cylinders is normal if the block is cold and sat for a while (oil drained down off the piston rings). Also depends on how many strokes the engine turned during the test. Usually gets to max after 5 or 6 rotations, fully charged battery with throttle propped open and all spark plugs removed. Count the strokes by watching the needle of the pressure gauge and use the same count for each cylinder. Since wet test was still low, could be valves or head gasket. Exhaust valves have hard lives in there. Maybe get the valves closed, then apply some compressed air into the spark plug hole, then listed at tail pipe and throttle and oil filler to see where leak is going. Take care for safety to mind potential for crank rotation when applying compressed air.

Originally Posted by TheBrokenRover

Okay just to make sure I don’t botch it. Should this be done cold or warm?

then I remove all plugs, disconnect the fuses for throttle and ignition, squirt a bit of oil in the cylinder and test it. Correct?