The cylinder surfaces were dirty, but no large collection of carbon. Gently cleaned them with brush & Scotchbrite pads. Suspected the rings, but the oil stays lightly stained, not black. Sometime difficult to see oil on dipstick other than a fluid line of course. Engine does not appear to use oil, but if so it is a minor amount. So having a ring issue was not on top of list, but not sure. Compression was good on both cylinders. Wouldn't pressure be off if faulty rings?
Thanks for the link
If issue continues after replacing last seal, this may be my winter project again including rings.
Thanks
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