If your compression gauge has a hose and the check valve is at the gauge instead of at the motor end, you can read 20 to 40 pounds depending on the diameter of the hose. On small cylinder engines, the volume of the gauge hose is significant, and adds to the volume of the cylinder. The longer the hose and the bigger the inside diameter; the lower the compression reading.
That being said, I’ve never seen one read below 30 pounds, but I imagine there are longer hoses out there.
If that’s the kind of gauge you have, See if it starts and runs.
Dave
