Valve, Valve Guide. And Valve Seat - Yamaha VMX12H Supplementary Service Manual

INSPECTION AND REPAIR
5. Measure:
Under specification
Over specification
Cylinder Head Warp Limit:
Less than 0.03 mm (0.0012 in)
VALVE, VALVE GUIDE, AND VALVE SEAT
Intake and Exhaust Valve
1. Inspect:
*Valve face
*Stem end
Replace.
Minimum Thickness (Service limit)
0.7 mm (0.028 in)
I
Beveled
4.0 mm (0.16 in)
2. Measure:
Valve stem clearance
Out of specification
and/or guide.
Use the Micrometer and Bore Gauge.
Valve Stem Clearance
0.010
Intake
(0.0004
0.025
Exhaust
(0.0010
Bore Gauge
Valve guide
head
Resurface.
Replace.
of specification
: 0.5 mm (0.020 in)
limit)
Replace either valve
Maximum
-
I
0.037 mm
0.0015 in) (0.0031 in)
I
-
0.052 mm
(0.0039 in)
0.0020 in)
Valve stem outside diameter
Valve guide inside diameter
:
I
:
I
I
3-20