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In my youth, I put in time working in an auto scrap yard. Lots of old tin there. Often the oil on the dipstick was clean as a whistle. That  was how I learned that dirty oil will settle out over time. That

which settled was now a layer of hard dirt not just in the bottom of the pan but everywhere oil had

been.

...like the inside of your crank. Here you are worried about compression and now what happens to

the journal surfaces when you start coursing oil through all the galleries?

All these all brit bikes are just big lawn mower engines. Pulling it out of the frame and putting it back

is more of a bother than tearing it down. Just do it.