Sounds like the seal is not working on that valve.
On Dec 10, 2011, at 2:40 PM, sprideteer wrote:
> Ten years ago I rebuilt the 1275 in my BE. Bores were barely worn (.003")
at the very top so I just lightly honed them and used new pistons and rings.
Installing the pistons, I chipped the top compression ring on #2 cyl. I heard
it happen, so removed the piston. The vendor had no stock on rings, nor could
I find them as a separate item, so I reused one of the old rings. That
cylinder was down about 10 psi (145 vs 155 on the others)a difference which I
decided not to worry about. The engine ran fine.
>
> Recently the #2 cylinder dropped to 110 psi (the other 3 still 155), and I
was able to locate a new set of the correct rings. I lightly honed the
cylinder, installed the new rings, replacing all rings including the top ring
which was broken, although the bore was not scored.
>
> Compression is now right up at 155, but that cylinder is now oiling the
spark plug. It runs great, compression has stayed @ 155, but the plug is
black oily. A new plug oils up in just a few miles, and there is a puff of
blue smoke on starting off after idling, although no blue smoke at speed.
>
> Are the rings in that cyl just not seated, or did I do something wrong (like
a compression ring upside down)?
>
>
>
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