Checking The Decompression System; Checking The Rocker Arms And Rocker Arm Shafts - Yamaha MT-03 Service Manual

3. Measure:
• Camshaft runout
Out of specification
Camshaft runout limit
0.040 mm (0.0016 in)
CHECKING THE DECOMPRESSION
SYSTEM
1. Check:
• Decompression system
a. Check the decompression system with the
camshaft sprocket installed on and the de-
compressor pin installed in the camshaft.
b. Check that the decompressor lever pin "1"
projects from the camshaft.
c. Check that the decompressor cam "2"
moves smoothly.
1
EAS00206
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to both of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear Replace.
Replace.
2
ROCKER ARMS AND CAMSHAFT
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pitting/
scratches
tion system.
3. Measure:
• Rocker arm inside diameter
Out of specification
Rocker arm inside diameter
12.000-12.018 mm
(0.4724-0.4731 in)
<Limit>: 12.036 mm (0.4739 in)
4. Measure:
• Rocker arm shaft outside diameter
Out of specification
Rocker arm shaft outside
diameter
11.981-11.991 mm
(0.4717-0.4721 in)
<Limit>: 11.955 mm (0.4707 in)
5. Calculate:
• Rocker-arm-to-rocker-arm-shaft clearance
NOTE:
Calculate the clearance by subtracting the
rocker arm shaft outside diameter from the
rocker arm inside diameter.
5-17
Replace or check the lubrica-
Replace.
Replace.