Service Manual

7-6 CAMSHAFT/CRANKSHAFT
Breather
The function of the breather is to create a vacuum in the crankcase which prevents oil from being forced out of the
engine through the piston rings, oil seals or gaskets. A sealed-type crankcase emission control system is used to eliminate
blow-by gases. The blow-by gases are led to the breather chamber through the crankcase and the camshaft. Then, it is
drawn into the clean side of the air cleaner through the cylinder head and the hose and mixed with the clean air flow, and
subsequently comes into the combustion chamber through the carburetor and the intake manifold.
Oil is primarily separated from the gases while passing through the inside of the rocker chamber from the crankcase,
and secondly separated from the gases in the breather chamber, and then returned back to the crankcase cover.