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CJR Performance

Oil Cap Crankcase Breather

  • Sale
  • $ 19.99


While the stock crankcase breather can be great for easy everyday cruising, it isn't sufficient with higher RPM abuse or an increase in power. Pressure and excess heat inside the cases increases quickly with harder riding styles and higher HP engines. As the piston travels up and down in the cylinder the excessive rise in pressure can cause resistance for the piston travel and in return, rob power. With this increase in pressure comes a drastic rise in heat as well. This is the LARGEST crankcase relief on the market with a 10mm relief diameter to help keep these engines running cooler.

Our new breather is now available in two options, a straight and as 90 degree fitting option depending on your clutch cover and vent line routing needs. 

13-Current CRF110F
14-Current CRF125F/FB

A crankcase hose color option will be available soon, in the meantime use this link for 13x18 rubber vent hose