VALVES AND VALVE SPRINGS
5-30
4. Lap:
•
Valve face
•
Valve seat
NOTICE
ECA24640
This model uses titanium intake and exhaust
valves.
Do not use the valves used for lapping the
valve seat. Always replace the valves used
for lapping with new ones.
TIP
•
When replacing the cylinder head, replace also
the valves with new ones without them.
•
When replacing the valves or the valve guides,
use new valves to lap the valve seats, and then
replace them with new valves.
a. Apply a coarse lapping compound “a” to
the valve face.
NOTICE
ECA13790
Do not let the lapping compound enter the
gap between the valve stem and the valve
guide.
b. Apply molybdenum disulfide oil onto the
valve stem.
c. Install the valve into the cylinder head.
d. Turn the valve until the valve face and the
valve seat are evenly polished, then clean
off all of the lapping compound.
TIP
While turning the valve lapper, tap and lap the
valve seat.
e. Apply a fine lapping compound to the
valve face, and repeat the above steps.
f. After every lapping step, be sure to clean
off all of the lapping compound from the
valve face and the valve seat.
g. Apply blue layout fluid “b” onto the valve
face.
h. Install the valve into the cylinder head.
i. Press the valve through the valve guide
and onto the valve seat to make a clear
impression.
j. Measure the valve seat contact width “c”
again. If the valve seat contact width is out
of specification, reface and lap the valve
seat.
EAM30093
CHECKING THE VALVE SPRINGS
1. Measure:
•
Valve spring free length “a”
Out of specification
Replace the valve
spring.
c
c
c
Free length limit (intake)
36.65 mm (1.44 in)
Free length limit (exhaust)
35.55 mm (1.40 in)
Содержание YZ450F 2021
Страница 6: ...EAM20162 YAMAHA MOTOR CORPORATION U S A YZ MOTORCYCLE LIMITED WARRANTY ...
Страница 10: ......
Страница 44: ...MOTORCYCLE CARE AND STORAGE 1 32 ...
Страница 61: ...TIGHTENING TORQUES 2 16 ...
Страница 62: ...CABLE ROUTING DIAGRAM 2 17 EAM20152 CABLE ROUTING DIAGRAM Frame and engine left side view ...
Страница 64: ...CABLE ROUTING DIAGRAM 2 19 Frame and engine right side view ...
Страница 66: ...CABLE ROUTING DIAGRAM 2 21 Handlebar front view ...
Страница 68: ...CABLE ROUTING DIAGRAM 2 23 Frame and engine top view ...
Страница 70: ...CABLE ROUTING DIAGRAM 2 25 Frame and battery top view ...
Страница 72: ...CABLE ROUTING DIAGRAM 2 27 Rear brake right side view ...
Страница 74: ...CABLE ROUTING DIAGRAM 2 29 ...
Страница 112: ...ELECTRICAL SYSTEM 3 36 ...
Страница 148: ...REAR BRAKE 4 34 system Refer to BLEEDING THE HYDRAULIC BRAKE SYSTEM on page 3 25 ...
Страница 188: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 2 EAM30507 LUBRICATION DIAGRAMS 1 Camshaft 2 Drive axle 3 Main axle ...
Страница 189: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 3 1 Connecting rod 2 Oil nozzle 3 Crankshaft ...
Страница 190: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 4 1 Exhaust camshaft 2 Intake camshaft 3 Oil filter element 4 Oil pump ...
Страница 191: ...LUBRICATION SYSTEM CHART AND DIAGRAMS 5 5 1 Oil filter element 2 Oil pump 3 Oil strainer ...
Страница 206: ...CAMSHAFT 5 20 6 Install Cylinder head breather hose Spark plug Spark plug 13 N m 1 3 kgf m 9 6 lb ft T R ...
Страница 262: ...TRANSMISSION 5 76 ...
Страница 272: ...WATER PUMP 6 9 ...
Страница 282: ...THROTTLE BODY 7 9 ...
Страница 289: ...IGNITION SYSTEM 8 6 ...
Страница 290: ...ELECTRIC STARTING SYSTEM 8 7 EAM20143 ELECTRIC STARTING SYSTEM EAM30279 CIRCUIT DIAGRAM ...
Страница 294: ...CHARGING SYSTEM 8 11 EAM20144 CHARGING SYSTEM EAM30282 CIRCUIT DIAGRAM ...
Страница 297: ...CHARGING SYSTEM 8 14 ...
Страница 298: ...FUEL INJECTION SYSTEM 8 15 EAM20145 FUEL INJECTION SYSTEM EAM30284 CIRCUIT DIAGRAM ...
Страница 321: ...FUEL INJECTION SYSTEM 8 38 ...
Страница 322: ...FUEL PUMP SYSTEM 8 39 EAM20146 FUEL PUMP SYSTEM EAM30287 CIRCUIT DIAGRAM ...
Страница 352: ...SELF DIAGNOSTIC FUNCTION AND DIAGNOSTIC CODE TABLE 9 15 ...
Страница 362: ...CHASSIS 10 9 ...
Страница 364: ......
Страница 366: ......
Страница 368: ...YZ450FM 2021 WIRING DIAGRAM B2W 2819U 11_W D indd 2 2020 02 05 10 21 39 ...