Engine Break-In - Yamaha wr450fb Owner's Manual

Engine break-in

WARNING
Failure to properly maintain the ve-
hicle or performing maintenance ac-
tivities incorrectly may increase
your risk of injury or death during
service or while using the vehicle. If
you are not familiar with vehicle ser-
vice, have a Yamaha dealer perform
service.
1. Before starting the engine, fill the
fuel tank with the fuel.
2. Start and warm up the engine.
Check the operation of the controls
and the engine stop switch. (See
page 4-7.) Then, restart the engine
and check its operation within no
more than 5 minutes after it is re-
started.
3. Operate the motorcycle in the low-
er gears at moderate throttle open-
ings for five to eight minutes. Stop
the engine.
4. Check how the engine runs when
the motorcycle is ridden with the
throttle 1/4 to 1/2 open (low to me-
dium speed) for about one hour.
OPERATION AND IMPORTANT RIDING POINTS
EAU52940 5. Start the engine and check the op-
eration of the motorcycle through-
EWA10321
out its entire operating range.
Restart the motorcycle and ride it
for about 10 to 15 more minutes.
The motorcycle will now be ready
to ride normally.
After the engine break-in period, thor-
oughly check the motorcycle for loose
parts, oil leakage and any other prob-
lems. Be sure to inspect and make ad-
justments thoroughly, especially cable
and drive chain slack and loose
spokes. In addition, check all fittings
and fasteners for looseness, and tight-
en if necessary.
NOTICE
When any of the following parts

have been replaced, they must
be broken in.
Cylinder or crankshaft:
About one hour of break-in op-
eration is necessary.
Piston, rings or transmission
gears:
These parts require about 30
minutes of break-in operation at
half-throttle or less. Observe the

ECA15560
6-4
condition of the engine carefully
during operation.
If any engine trouble should oc-
cur during the engine break-in
period, immediately have a
Yamaha dealer check the vehi-
cle.
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