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If replacing the oil filter doesn't work, another possibility is that the oil pump has lost it's prime, and that there is an air bubble in the path.
The way to fix that, is to manually prime the oil pump by filling the oil filter full of oil and screwing it onto the engine, or by directly pouring some oil down into the screw fitting that the filter screws onto.
This has happened to me twice, on engines of different applications. It's rare, but it happens.
Alacrity, 1981 Tartan 33 #168