7-41
Power unit
POWR
4.
Measure the valve guide inside diameter.
Checking the valve seat
1.
Eliminate carbon deposits from the
valves.
2.
Apply a thin, even layer of Mechanic’s
blueing dye (Dykem) onto the valve
seats.
3.
Lap the valve slowly on the valve seat
with a special service tool
a
.
4.
Measure the valve seat contact width
a
where the blueing dye is adhered to the
valve face. Reface the valve seat if the
valve is not seated properly or if the valve
seat contact width is out of specification.
Replace the valve guide if the valve seat
contact width is uneven.
Refacing the valve seat
After every lapping procedure, make sure to
clean off any remaining lapping compound
from the cylinder head and the valves.
1.
Reface the valve seats with the valve
seat cutters.
Valve guide inside diameter:
5.504–5.522 mm
(0.2167–0.2174 in)
Valve lapper
a
: 90890-04101
a
a
Valve seat contact width
a
:
Intake:
1.10–1.40 mm (0.043–0.055 in)
Exhaust:
1.40–1.70 mm (0.055–0.067 in)
Valve seat cutter holder: 90890-06316
Valve seat cutter:
30° (intake): 90890-06817
30° (exhaust): 90890-06326
45° (intake): 90890-06816
45° (exhaust): 90890-06325
60° (intake and exhaust): 90890-06324
30
45
60
Summary of Contents for F150B
Page 1: ...SERVICE MANUAL 6BM 28197 5L 11 F150B FL150B ...
Page 4: ......
Page 211: ...6 34 Vapor separator 0 1 2 3 4 5 6 7 8 9 10 A MEMO ...
Page 311: ...8 32 Shimming regular rotation model 0 1 2 3 4 5 6 7 8 9 10 A Shim location F R P T3 T1 T2 ...
Page 351: ...8 72 Shimming counter rotation model 0 1 2 3 4 5 6 7 8 9 10 A Shim location F R P T3 T2 T4 T1 ...
Page 448: ...A 1 MEMO ...
Page 451: ......
Page 452: ...Printed in China Jul 2008 0 6 1 ABE E_4 YAMAHA MOTOR CO LTD ...
Page 458: ......