Hi all.

Partial user error. Check valve may be faulty. I was using an adaptor
to help reach the spark plug holes. Not needed. BUT, when tester under
pressure, instead of releasing air with valve, I popped it off the
flex hose. "pop!". Pressure in the flex hose. Of course the one way
valve is at end of flexible line. This valve may be suspect.
Regardless it worked fine without adaptor.

Used w/o adaptor (engine cold) I got:

150 150 150 Then......

50 on # 3. :((

The plug on this cylinder also looked fouled when I first looked into
this engine. #3 also has what look like collapsible push rod tubes.
There is one of these on # 4 too.

#3 may be Hinky.

When testing other cylinders, I hear a "bluuup bluuup" sound. With
tester installed on #3, no "bluuup bluuup" sound.

Maybe lifters are soft from all that gas? I couldn't feel any obvious
play at rockers. (valves closed)

Also hinky; oil pressure switch not connected. And I can't find the
wire/connector. (??)

Time to start yanking sh*t off.

--
Neil Nicholson. 1981 Air Cooled Westfalia -
"Jaco"  (Bustorius)

http://web.mac.com/tubaneil