Ok...lol. Long day. I got it. Duh.
Just finished. Yep, did that. Put exactly 1gallon and 300 ML back in.And don't just dump in 4.1 litres when you change oil and filter as you may overfill it. Depends on how you drain the oil - drain on centre stand then side stand gets another 0.2 litres out.Refill with ~3.8 litres, warm the bike up then check the oil and top up.