Engine Mechanical: 1D-33
NOTE
• Be sure to cool down the cylinder head to
ambient air temperature.
• Insert the reamer from the combustion
chamber side and always turn the reamer
handle clockwise.
9) Reassemble the cylinder head. Refer to “Cylinder
Head Disassembly and Reassembly (Page1D-25)”.
10) Install the cylinder head assembly. Refer to “Engine
Top Side Assembly (Page1D-18)”.
Valve Seat Repair
B705H11406052
The valve seats (1) for both the intake and exhaust
valves are machined to three different angles. The seat
contact surface is cut at 45°.
CAUTION
!
• The valve seat contact area must be
inspected after each nut.
• Do not use lapping compound after the
final cut is made. The finished valve seat
should have a velvety smooth finish but
not a highly polished or shiny finish. This
will provide a soft surface for the final
seating of the valve which will occur
during the first few seconds of engine
operation.
NOTE
After servicing the valve seats, be sure to
check the valve clearance after the cylinder
head has been reinstalled. Refer to “Valve
Clearance Inspection and Adjustment in
Section 0B (Page0B-4)”.
Cylinder Disassembly and Assembly
B705H11406059
Refer to “Engine Top Side Disassembly (Page1D-16)”
and “Engine Top Side Assembly (Page1D-18)”.
Disassembly
• Remove the water inlet connector (1).
Assembly
• Apply engine coolant to the O-ring.
CAUTION
!
Replace the O-ring with a new one.
Tightening torque
Water inlet connector bolt: 10 N·m (1.0 kgf-m, 7.0 lb-
ft)
Intake Exhaust
Seat angle 30°/45°/60°
Seat width 0.9 – 1.1 mm (0.035 – 0.043 in)
Valve diameter
31 mm
(1.22 in)
27 mm
(1.06 in)
Valve guide I.D. 4.500 – 4.512 mm (0.1969 – 0.1973 in)
(A)
(C)
(E)
I705H1140063-04
1
I705H1140224-01
1
I705H1140142-01
I705H1140143-01
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