Try and get a modem motorcycle to perform like that and you would soon have a crankcase full of swarf.
A quaint Drummond custom was to leave the headstock oiler nuts without covers - allowing swarf and dirt to drop into the bearings.
Using a sharp knife or half round file remove the swarf from inside the ends of the pipes.
After cleaning any swarf away, I refitted the elbow, and then fitted the hose fitting with some PTFE tape on the threads.
Rotate half a turn, then back out, then rotate again Regularly back the tap out of the hole to clear any swarf.