Valve Seat Repair; Engine Bottom Side Disassembly - Suzuki kq500 Service Manual

1D-46 Engine Mechanical:

Valve Seat Repair

The valve seats (1) for both the intake and exhaust
valves are machined to two different angles. The seat
contact surface is cut at 45°.
45°
Intake
Seat angle 15°/45°
0.9 – 1.1 mm
Seat width
(0.035 – 0.043 in)
Valve 30.6 mm
diameter (1.20 in)
Valve guide 5.000 – 5.012 mm
I.D. (0.1969 – 0.1973 in)
CAUTION
!
• The valve seat contact area must be
inspected after each cut.
• 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".
B931H21406033
15°
1
I827H1140074-01
Exhaust
←
←
27.0 mm
(1.06 in)
←

Engine Bottom Side Disassembly

1) Remove the engine assembly. Refer to "Engine
Assembly Removal (Page 1D-13)".
2) Remove the front propeller shaft universal joint (1)
and rear propeller shaft boot (2). Refer to "Front
Propeller Shaft Removal and Installation: in
Section 3D" and "Rear Propeller Shaft Removal
and Installation: in Section 3D".
1
Engine Top Side
Remove the engine top side (1). Refer to "Engine Top
Side Disassembly (Page 1D-18)".
Starter Motor
Remove the starter motor (1).
B931H21406034
2
I931H1140171-01
1
I931H1140172-01
1
I931H1140173-01