ENGINE 3-25
• If the seat width
W
measured exceeds the standard value or
seat width is not uniform, refuse the seat using the seat cutter.
Valve seat width
W
:
Standard: 0.9 – 1.1 mm (0.09 – 0.11 in)
If the valve seat is out of specification, correct the seat by servic-
ing it as follows:
VALVE SEAT SERVICING
• The valve seats
1
for both the intake valve
2
and exhaust
valve
3
are machined to three different angles. The seat con-
tact surface is cut at 45°.
NOTE:
After servicing the valve seats, be sure to check the valve clear-
ance after the cylinder head has been reinstalled. (
2-7)
• Clean and assemble the head and valve components. Fill the
intake and exhaust ports with gasoline to check for leaks.
• If any leaks occur, inspect the valve seat and face for burrs or
other things that could prevent the valve from sealing.
#
INTAKE
EXHAUST
seat angle
45°
45°
seat width
0.9 – 1.1 mm
(0.09 – 0.11 in)
0.9 – 1.1 mm
(0.09 – 0.11 in)
valve diameter
22.5 mm (0.89 in)
19 mm (0.75 in)
valve guide I.D.
5.500 – 5.512 mm
(0.2165 – 0.2170 in)
5.500 – 5.512 mm
(0.2165 – 0.2170 in)
* 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 fin-
ish. This will provide a soft surface for the final seat-
ing of the valve which will occur during the first few
seconds of engine operation.
Always use extreme caution when handling gasoline.
15
˚
45
˚
30
˚
45
˚
Содержание LT-Z90K7
Страница 1: ...9 9 5 0 0 4 0 0 2 0 0 1 E ...
Страница 38: ...PERIODIC MAINTENANCE 2 25 ...
Страница 39: ...2 26 PERIODIC MAINTENANCE ...
Страница 131: ...4 10 FUEL SYSTEM Remove the choke lever J Remove the starter plunger K ...
Страница 234: ...7 18 SERVICING INFORMATION FUEL HOSE PIPING Fuel tank breather hose Handlbers Vacum hose Clip Clip Fuel hose Fuel valve ...
Страница 237: ...SERVICING INFORMATION 7 21 EXHAUST PIPE COVER 8 5 8 5 8 5 5 6 4 5 ...
Страница 251: ...Prepared by September 2006 Part No 99500 40020 01E Printed in Japan 254 ...
Страница 252: ...Printed in Japan K7 ...