Avoid costly engine damage with our YFZ450R Valve Cover Breather mod.
The stock breather line fitting can come loose, pop out and push oil out the top of the engine as the engine heats up due to the different expansion rates of the magnesium valve cover and steel breather fitting. (magnesium expands sooner and the slip in fitting becomes loose)
Send your cover in(with gaskets removed) after placing an order and we will add a screw in fitting so you dont have to worry about the stock fitting coming loose and pushing oil out. (24hr turnaround)
-Fitting will work with stock or aftermarket breather systems that use stock size hose.