16
ENGINE
145
304552-10
–
Pretension the valve spring using the special tool.
Valve spring compressor (59029019000) (
Insert for valve spring lever (90129060000) (
–
Mount valve keys. Relax the valve spring.
Info
When mounting the valve keys, check that they are seated correctly; prefer-
ably, fix the valve keys to the valve with a little grease.
–
Place shims into the valve spring retainers according to the installation position.
16.4.39 Checking the cylinder head (200 Duke)
304520-10
–
Check valve guides
1
with the special tool.
Limit plug gauge (90129026000) (
» If the special tool is easy to insert into the valve guide:
–
Change the valve guides and valves.
–
Check the sealing area of the spark plug thread and the valve seats for damage and
tearing.
» If there is wear or tearing:
–
Change the cylinder head.
304521-10
–
Check the sealing area of the cylinder for distortion using a straight edge and the
special tool.
Feeler gauge (59029041100) (
Cylinder/cylinder head - distortion of
sealing area
≤
0.10 mm (
≤
0.0039 in)
» If the measured value does not equal the specified value:
–
Change the cylinder head.
302808-10
–
Check sealing seat
A
of the valves.
Valve - sealing seat width
Intake
0.90… 1.10 mm (0.0354…
0.0433 in)
Valve - sealing seat width
Exhaust
0.90… 1.10 mm (0.0354…
0.0433 in)
» If the measured value does not equal the specified value:
–
Machine the valve seat.
–
Blow compressed air through all oil holes and check that they are clear.
16.4.40 Checking/measuring the cylinder (200 Duke)
304540-10
–
Check the cylinder bearing surface for damage.
» If the cylinder bearing surface is damaged:
–
Change the cylinder and piston.
–
Measure the cylinder diameter at several places in the
X
and
Y
axes using a
micrometer to check for oval wear.
Guideline
Cylinder - bore diameter
72.016… 72.027 mm (2.83527…
2.8357 in)