Sounds like contaminants in your fuel tank to me.
But that is a very rough armchair guess.
A compression test is also in order
The rubber seals in the valve lash adjust covers can get to hard to properly seal. This will lead to
oil down the front and sides of the motor due to wind blowing it around.
As a temp fix I did a bead of silicone gasket sealer around these little covers and all of a sudden I
don't have a slow leak.
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