Sump reed valve breather
Replace your sump plug with this one way reed valve breather to reduce oil leaks and pump out excess wet sump oil on start up. Fits all Norton Twins with a large screened sump plug. Simple and compact with shallow depth. Uses high quality BMW reed. Adustable so the hose barb points rearward. Plugs are provided to blank off the 750 left side cam vent or the 850 timing side vent. Requires a 1-3/4″ socket or wrench for installation. The only sump reed valve breather that fits a pre-71 Commando with crossover frame tube. JSM is the original innovator of the Norton reed valve sump breather starting in 1985. This is the most efficient compact sump breather on the market (more info).