Checking The Decompression System; Checking The Rocker Arms And Rocker Arm Shafts; Installing The Camshaft And Rocker Arms - Yamaha Grizzly550 User Manual

EAS28P1028

CHECKING THE DECOMPRESSION SYSTEM

1. Check:
• Decompression system
M MMM M MMM M M MMM M M MMM M
a. Check the decompression system with the
camshaft sprocket installed on the decom-
pressor lever and pin installed in the cam-
shaft.
b. Check that the decompressor lever pin "1"
projects from the camshaft.
c. Check that the decompressor cam "2" moves
smoothly.
1
L LLL L LLL L L LLL L L LLL L
EAS23880
CHECKING THE ROCKER ARMS AND
ROCKER ARM SHAFTS
The following procedure applies to all of the
rocker arms and rocker arm shafts.
1. Check:
• Rocker arm
Damage/wear → Replace.
2. Check:
• Rocker arm shaft
Blue discoloration/excessive wear/pit-
ting/scratches → Replace or check the lubri-
cation system.
3. Measure:
• Rocker arm inside diameter
Out of specification → Replace.
ROCKER ARMS AND CAMSHAFT
M MMM M M MMM M MMM
2
L LLL L L LLL L LLL
5-19
Rocker arm inside diameter
12.000–12.018 mm (0.4724–
0.4731 in)
4. Measure:
• Rocker arm shaft outside diameter
Out of specification → Replace.
Rocker arm shaft outside diame-
ter
11.981–11.991 mm (0.4717–
0.4721 in)
5. Calculate:
• Rocker-arm-to-rocker-arm-shaft clearance
Out of specification → Replace the defective
part(s).
Rocker-arm-to-rocker-arm-shaft
clearance
0.009–0.037 mm (0.0004–0.0015
in)
TIP
Calculate the clearance by subtracting the rock-
er arm shaft outside diameter from the rocker
arm inside diameter.
EAS24040
INSTALLING THE CAMSHAFT AND ROCKER
ARMS
1. Install:
• Bearing "1"
(onto the cylinder head)