ENGINE 3-37
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. (
$
2-5)
• 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
15°, 45°
15°, 45°
seat width
0.9 – 1.1 mm (0.035
– 0.043 in)
0.9 – 1.1 mm (0.035
– 0.043 in)
valve diameter
30.6 mm (1.20 in)
27 mm (1.06 in)
valve guide I.D.
5.000 – 5.012 mm
(0.1968 – 0.1973 in)
5.000 – 5.012 mm
(0.1968 – 0.1973 in)
* The valve seat contact area must be inspected after
each cut.
* Do no t us e lapping compound a fter the fin al 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.
45˚
15˚
·
Summary of Contents for LT-A450X
Page 2: ...SUPPLEMENTS LT A450XK9 09 MODEL LT A450XK8 12 13 WIRING DIAGRAM 14 ...
Page 47: ...PERIODIC MAINTENANCE 2 29 ...
Page 48: ...2 30 PERIODIC MAINTENANCE ...
Page 63: ...ENGINE 3 7 Remove the engine mounting nuts Remove the engine from the right side ...
Page 215: ......
Page 315: ...7 24 COOLING AND LUBRICATION SYSTEM ENGINE LUBRICATION SYSTEM To cylinder head OIL PUMP ...
Page 316: ...COOLING AND LUBRICATION SYSTEM 7 25 EXHAUST SIDE INTAKE SIDE ...
Page 317: ......
Page 332: ...8 14 CHASSIS REAR CARRIER Remove the rear carrier REAR BOX Remove the rear box 1 ...
Page 417: ......
Page 452: ...9 34 ELECTRICAL SYSTEM HEADLIGHT INSTALLATION Head light coupler Head light R Adjusting point ...
Page 484: ...10 26 SERVICING INFORMATION Rear box Rear fender Right mud guard Left mud guard ...
Page 510: ......
Page 514: ......