VALVE MECHANISM INSPECTION AND SERVICING
The diagram below depicts the common valve train of a four-stroke engine. It consists of an over-head valve
train with the intake port, exhaust port, and cam shaft located in the cylinder head. The valves are located in the
top of the combustion chamber.
• Remove fan shroud assembly
- Remove cylinder shroud assembly
• Remove Phillips screw and O-ring
from cam chain tensioner.
• Insert small, straight screwdriver and turn
clockwise until spring loaded tensioner locks.
This allows slack in cam chain
for removal of cam shaft. (1)
• Remove the 2 bolts and 4 fl ange nuts and washers.
• Remove cam shaft holder and dowel pins.(2)
• Remove cam chain from sprocket and remove cam shaft.(3)
• Remove cylinder head and gasket.(4)
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