I would not drive much at all with a weak cylinder like that.

no matter what...operating with something out of spec like that
contributes to Even More wear wear on the engine.

I would do a leak-down test next , to get an idea if it's more valves or
rings ..
and take the appropiate repair action.

( not that it shouldn't have a cleaned up crankshaft and new bearings at
these total miles anyway  ....they do just 'let go' I see here and
there. That is strangely 'good' oil pressure.
   I would expect about 15 psi max , fully warm, at idle, with 20W50.
Got 80 weight in it ..or ? )

Scott
On 5/24/2014 6:30 AM, 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.
>