3.ENGINE
3-4
REMOVE THE ROCK ARMS AND CAMSHAFT
1.Loosen
：
·Locknuts“1”
·Valve clearance adjusting screws“2”
2.Remove
：
·Intake rocker arm shaft
·Intake rocker arm
·Exhaust rocker arm shaft
·Exhaust rocker arm
3.Remove
：
·Camshaft
TIP
Screw an 5mm bolt “1”into the threaded of the rocker arm shaft
，
and then pull out the shaft.
CHECK THE CAMSHAFT
1.Check
：
·Camshaft lobes
Blue discoloration/pitting/scratches→Replace the camshaft.
2.Measure
：
Camshaft lobe dimensions “a”and“b”
Out of specification→Replace the camshaft.
CHECKING THE ROCKETER ARMS AND ROCKER ARM SHAFTS
The following procedure applies to all
of the rocker arms and rocker arm shafts.
REMOVING THE VALVES
The following procedure applies to all of
the valves and related components
TIP
Before removing the internal parts of the cylinder
head
（
e.g.
，
valves
，
valve springs
，
valve seats
）
，
make sure the valves properly seal.
1.Check
·Valve sealing
Leakage at the vale seat →Check the valve face
，
valve seat contact width.
2.Remove
：
·Valve cotters
TIP
Remove the valve cotters by compressing the valve
spring with the valve spring compressor“1”and
the valve spring compressor attachment“2”
3.Remove
：
·Valve spring retainer“1”
·Outer valve spring“2”
·Inner valve spring“3”
·Valve“4”
·Valve spring seat“5”
·Valve stem seal“6”
TIP
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
1
2
1
1
2
3
4
5
6