Maybe it just needs to break in a little?
The easiest way to have confidence in a new compression gauge is to compare it with a “known good” gauge. Maybe a friend has one?
I see posts all the time about incorrect readings from the typical Harbor Freight gauges. The other thing to be aware of is the location of the valve. For small displacement engines it is better (more accurate) to select a gauge with the valve right at the motor end of the hose. Reason being is that you do not have the extra volume of the hose to fill; adding to the displacement of the cylinder if you will…..
Thank you , Seakaye….It runs so good.
I’ll check those tips out.
I just watched a video on compression testers with a Schrader Valve and I’m sure that’s exactly my problem.
I’m using an automotive compression tester !
Thank you very much !