What is the black debris on the clean side of the air filter, looks like blowby oil mist from the crankcase breathers.
Could be from an over filled crankcase that Honda always does when they do oil changes.
The 2nd ST1300 that I bought in May 22 came with a fresh oil change from Honda and yes, the oil sight glass was overfilled with no air bubble in the sight glass. After putting 6,000 Km's on it since May, I'm seeing a tiny air bubble at the top of the sight glass when I put it on the center stand.
When I put it on the side stand, there is no oil showing in the sight glass.