Section 03
ENGINE
Subsection 09
(CYLINDER AND HEAD)
03-09-16
VMR2004_132_03_09A.FM
VALVE
Removal
Remove valve spring.
Push valve stem then pull valves
no. 36
(intake)
and
no. 37
(exhaust)
out of valve guide
no. 40
.
1. Intake valve 31 mm
2. Exhaust valve 27 mm
Remove valve stem seal
no. 38
with special pliers
such as Snap-ON YA 8230.
Inspection
Valve Stem Seal
Inspection of valve stem seals is not needed because
new seals should always be installed whenever
cylinder head is removed.
Valve
Inspect valve surface, check for abnormal stem
wear and bending. If out of specification, replace by
a new one.
Valve Stem and Valve Guide Clearance
Measure valve stem and valve guide in three places
using a micrometer and a small bore gauge.
NOTE:
Clean valve guide to remove carbon depos-
its before measuring.
Change valve if valve stem is out of specification
or has other damages such as wear or friction sur-
face.
A. Valve stem diameter
1
R400motr82A
2
R610motr125A
VALVE OUT OF ROUND
NEW NOMINAL
EXHAUST
0.005 mm (.0002 in)
INTAKE
SERVICE LIMIT
EXHAUST
0.06 mm (.0024 in)
INTAKE
R400motr83A
A
Содержание M-50 x 4
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Страница 136: ...Section 04 FUEL SYSTEM Subsection 03 CARBURETOR VMR2004_137_04_03A FM 04 03 1 CARBURETOR 0 V07F0ZS Harness assembly ...
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