BIKE WITH THE FIRST REED VALVE SUMP BREATHER 1985

In the photo below you can see a large red hose running from the sump to the oil tank.  This is the motor that had the first reed valve sump breather (Mk2 engine cases) .  The reed valve was mounted at the bottom of the hose.  It was one of many experiments and it went through many changes.  As far as I know this was the first reed valve ever mounted to a motorcycle engine.