My CB750 K2, Oiltank has a ventilation hose to free air. Must be routed to the side to avoid tire if it decide to puke oil.
My hose is not that long, just so the end is beside oul lines with valve cover ventilation.
My K6 had longer valve cover ventilation hose hanged in a special holder in the rear foot peg bolt angled outwards and down.
I always fill-up oil to max on dipstick AFTER a ride. A harder ride can fill tank a little bit more.
My K2 has 5mm over max after last oil change.
No oil puke.
I thought I had an oil leak yesterday. I checked the oilfilter bolt before digging deeper.
Lucky me, it was not tightened enough. I tightened it by very light hand at last change.
I have had thoughts about too hard tightened oil bolt that squeeze o-ring beyond its flex and start leaks making the front part of engine really dirty.
This seems to need a retighten after a real warm up.
