HOW TO USE THIS MANUAL
This manual is intended as a handy, easy-to-read reference book for the mechanic.
Comprehensive explanations of all installation, removal, disassembly, assembly, repair and check
procedures are laid out with the individual steps in sequential order.
9
The manual is divided into chapters and each chapter is divided into sections. The current sec-
tion title is shown at the top of each page
1
.
9
Sub-section titles appear in smaller print than the section title
2
.
9
To help identify parts and clarify procedure steps, there are exploded diagrams at the start of
each removal and disassembly section
3
.
9
Numbers are given in the order of the jobs in the exploded diagram. A number indicates a dis-
assembly step
4
.
9
Symbols indicate parts to be lubricated or replaced
5
.
Refer to “ILLUSTRATED SYMBOLS”.
9
A job instruction chart accompanies the exploded diagram, providing the order of jobs, names of
parts, notes in jobs, etc.
6
. This step explains removal procedure only. For installation, reverse
the steps.
9
Jobs requiring more information (such as special tools and technical data) are described
sequentially
7
.
ENG
3-20
CYLINDER HEAD COVER, CYLINDER HEAD
6
5
4
3
2
7 8
9
7 8
11 Nm (1.1 m · kgf, 8.0 ft · lbf)
20 Nm (2.0 m · kgf, 14 ft · lbf)
2.3 Nm (0.23 m · kgf, 1.7 ft · lbf)
12 Nm (1.2 m · kgf, 8.7 ft · lbf)
50 Nm (5.0 m · kgf, 36 ft · lbf)
1st
2nd
7 Nm (0.7 m · kgf, 5.1 ft · lbf)
9
1
Order
Job/Parts to remove
Q’ty
Remarks
Removing the cylinder head cover,
cylinder head
Remove the parts in the order listed.
Fuel tank
Refer to “FUEL TANK” on 3-4.
Muffler
Refer to “MUFFLER” on 3-6.
Air filter
Refer to “AIR FILTER” on 3-3.
Carburetor
Refer to “CARBURETOR” on 4-1.
Flywheel cover
Refer to “FLYWHEEL” on 3-12.
1
Spark plug cap
1
2
Spark plug
1
3
Air filter case stay
1
4
Cylinder head cover
1
5
Cylinder head cover gasket
1
6
Cylinder air shroud
1
7
Locknut
2
8
Adjuster
2
9
Screw
2
CYLINDER HEAD COVER, CYLINDER HEAD
ENG
3-22
CYLINDER HEAD COVER, CYLINDER HEAD
CHECKING THE PUSH ROD
1. Check:
9
Push rod runout
Runout limit:
Refer to “SPECIFICATIONS” in
the Supplementary service
manual.
Out of specifications
→
Replace.
CHECKING THE CYLINDER HEAD
1. Check:
9
Cylinder head combustion chamber
Check the combustion chamber for car-
bon deposits.
Any carbon deposits
→
Eliminate.
TIP
Be sure not to damage the contact surface of
the cylinder.
2. Check:
9
Cylinder head
Cracks/damage around the hole of
spark plug
→
Replace.
CHECKING THE ROCKER ARM
1. Check:
9
Rocker arm
Wear/damage/cracks
→
Replace.
1
4
3
6
7
2
5
