CF MOTO CF1000ATR 2018, Руководство по обслуживанию, Страница: 131 / 365

CFMOTO
05-56
1 Va l v e S e a t
Contact Width 2
Valve Contact
Surface Width
1 Valve Spring
Lower Seat 2
Sealing Lips of Valve
Stem Seal
055601
055602
Valve Bevel and Valve Seat
Check valve face and seat for burning
or pitting Replace valve or cylinder
head if there are signs of damage.
Ensure seating of valves properly. Apply
some lapping compound to valve face and
work valve on its seat with a lapping tool
(see Valve Installation Procedure below).
Measure valve face contact width.
Note: The location of contact area
should be in center of valve seat.
Measure valve seat width with a caliper.
Valve seat width
Exhaust
New
1.20 mm~1.40 mm
(0.047 in~0.055 in)
Service limit 1.80 mm (0.071 in)
Intake
New
1.10 mm~1.30 mm
(0.043 in~0.051 in)
Service limit 1.70 mm (0.067 in)
If valve seat contact width is too wide or
has dark spots, replace the cylinder head.
Valve Installation
For installation, reverse the removal
p r o c e d u r e . P a y a t t e n t i o n t o t h e
following details. Install a NEW valve
stem seal. Make sure spring seat
is installed before installing seal.
Apply engine oil on valve stem and install
it.
Warning: Be careful when valve stem is
passed through sealing lips of valve stem
seal.
To ease installation of cotters, apply oil
or grease on them so that they remain
in place while releasing the spring.
After spring is installed, ensure it is
properly locked by tapping on valve stem
end with a soft hammer so that valve
opens and closes a few times.
Warning: An improper locked valve
spring will cause engine damage.
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