We offer the most efficient breather modification for Commandos on the market. This kit is developed and designed for maximum performance. We have operated this through a variety of circumstances and rpm ranges and how found it to actually pull a vacuum in the crankcases up to about 4000 rpm. From there to red line it’s virtually running at 0 pressure. The benefits are many and the idea of reducing the excessive pressure in the crankcases that, due to the parallel twin design, will free up the engine and actually create some horse power. It will also virtually eliminate any and all leaks associated with the pressure in the cases. You will notice this where there is a gasket, seal or a material joint. 

There is one Commando engine that was built that will allow the cNw breather to be installed without taking the engine apart. This is the engine built in 1972 that originally has a large tubular breather installed on the backside of the cases. So it’s located inbetween the transmission and the engine. By removing this original breather and installing our model you will get all the benefits these well engineered breathers offer