[SpudRider]

The oil separator for the Honda XR650L is connected in the following manner.



The Honda engineers designed the crankcase breather as a closed system which vents into the air box behind the air filter. This location places the vent in an area of high air flow, which draws vapors containing contaminants out of the crankcase. Contaminated vapors are present because the piston rings do not seal one hundred percent, and combustion gasses sneak by the piston rings. The oil separator collects the oil and liquid contaminants from the crankcase gases, and allows the recaptured liquid to re-enter the crankcase. The contaminated gases are inserted into the fuel/air mixture, and burned in the combustion process.