Ignoramus28889 fired this volley in
:

Lloyd, I am not fully convinced that it is a valve problem. It is more
likely to be a cylinder problem, because air is leaking through
exhaust. I will try a troubleshooting technique that I mentioned to
try to isolate the issue.


The exhaust port of the cylinder? I thought it was double-acting, with a
4-way valve?

If the cylinder's rings were leaking, you'd get that leak on both
strokes, not just on the extension.

I'm bettin' on a spool ring.

LLoyd