If it was in my driveway the test would now be to loosen the valve
adjusters a full turn on that low reading cylinder. Then compression
test that cyl again.

At this point I would pull the 1 plug, test the compression again to get
a new base reading and since the other plugs are still in, then remove
valve cover, loosen 1 adjuster for that cyl exactly 360 degrees. Test
compression, loosen the other adjuster 360 degrees, test again. The
reason for 360 degrees is that the adjusters get flat spots worn into
them over time and a fraction of a turn loosening can actually bring a
high spot into position and then the clearance is actually tighter
rather than looser. Having 2 new adjustors on hand might be good too so
you can replace the adjusters if mushroomed or pitted.

Mark

Loren Busch wrote:
> In a '90 Westy, stock 2.1L WBX with 185k miles, auto tranny
>
> Recent compression test is 150, 145, 135, 70.  Number one is 70.
> So, two questions.
> How long can I drive with this condition before I have major problems?
> And second, what is my best solution to this.
> BTW, oil pressure is good, 60 psi at idle warm.
>