Don't sound good.  Its probably the rings and a rebuild is the answer.  See
John Muir's book.

James
'67 deluxe
'71,81,'85 Westies

>My '66 has an engine in it of questionable lineage.
>
>At any rate, compression in #3 is very low, like 50, where all the others
>are pretty reasonable, around 95 - 105.
>
>I ran compressed air into the cylinder, and checked to see where it cam out.
>(Cylinder was in firing position)
>
>There appeared to be a draft coming out the exhaust pipe (uhoh), and perhaps
>a hint (I could be wrong about this one) coming out the carb.
>
>I also took the valve cover off and there appeared to be a hint of air coming
>out of the exhaust pushrod tube.
>
>I have a feeling none of the above is good:-}
>
>What I was wondering, is given the symptoms, would a replacement head go a
>good distance to solving some of these problems?  Are heads usually replaced in
>pairs?
>
>Thanks,
>..Markus
>
>----------------------------------
>'66 "rough looker, hackjob skylit" Westy aka "The Tardis"
>                        (british racing green/white)
>'74  Thing              (pumpkin orange)
>'78  Bug 'vert          (black, white top)

'67 deluxe
'71,81,'85 Westies