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.
9The 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.
9Sub-section titles appear in smaller print than the section title 2.
9To help identify parts and clarify procedure steps, there are exploded diagrams at the start of
each removal and disassembly section 3.
9Numbers are given in the order of the jobs in the exploded diagram. A number indicates a dis-
assembly step 4.
9Symbols indicate parts to be lubricated or replaced 5.
Refer to “ILLUSTRATED SYMBOLS”.
9A 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.
9Jobs requiring more information (such as special tools and technical data) are described
sequentially 7.
ENG
3-20
CYLINDER HEAD COVER, CYLINDER HEAD
6543
2
78
9
78
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
