Yamaha WR450FB 2012, Owner'S Service Manual

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STARTING AND BREAK-IN
1-31
EAS1DX3057
HANDLING NOTE
EWA1DX1005
WARNING
Never start or run the engine in a closed ar-
ea. The exhaust fumes are poisonous; they
can cause loss of consciousness and death
in a very short time. Always operate the ma-
chine in a well-ventilated area.
ECA
NOTICE
• Unlike a two-stroke engine, this engine
cannot be kick started when the throttle is
open because the kickstarter may kick
back. Also, if the throttle is open the air/
fuel mixture may be too lean for the engine
to start.
• Before starting the machine, perform the
checks in the pre-operation check list.
EAS1DX3058
AIR FILTER MAINTENANCE
According to "CLEANING THE AIR FILTER
ELEMENT" section in the CHAPTER 3, apply
the foam-air-filter oil or its equivalent to the ele-
ment. (Excess oil in the element may adversely
affect engine starting.)
EAS1DX3059
STARTING A COLD ENGINE
In order for the ignition circuit cut-off system to
enable starting, one of the following conditions
must be met:
• The transmission is in the neutral position.
• The transmission is in gear with the clutch le-
ver pulled.
1. Push the main swtch to “ON”.
The following warning light should come on
for a few seconds, then go off.
• Fuel level warning light
• Engine trouble warning light
ECA1DX1006
NOTICE
If the warning light does not come on initial-
ly when the main switch is pushed to “ON”,
or if the warning light remains on, have a
Yamaha dealer check the electrical circuit.
2. Shift the transmission into the neutral posi-
tion. The neutral indicator light should come
on. If not, ask a Yamaha dealer to check the
electrical circuit.
3. Turn the starter on and completely close the
throttle.
4. Start the engine by pushing the start switch
or by pushing the kickstarter lever down.
ECA1DX1007
NOTICE
If the starter motor will not turn when push-
ing the start switch, stop pushing it immedi-
ately and start the engine by pushing the
kickstarter lever down in order to avoid the
load on the motor.
TIP
Use the kickstarter in a condition with ambient
temperature below –5 °C (40 °F ) or high alti-
tude.
If the engine fails to start when using the
start switch, release it, wait a few seconds,
and then try again.
Each starting attempt should be as short as
possible to preserve the battery. Do not
crank the engine more than 10 seconds on
any one attempt. If the engine does not start
with the starter motor, try using the kickstart-
er.
5. When the engine is warm, turn the starter
off.
TIP
The engine is warm when it responds quickly to
the throttle with the starter turned off.
ECA1DX1008
NOTICE
For maximum engine life, never accelerate
hard when the engine is cold!
EAS1DX3060
STARTING A WARM ENGINE
Follow the same procedure as for starting a
cold engine with the exception that the starter is
not required when the engine is warm.
TIP
• If the engine does not start at high altitude,
start the engine with the throttle grip opened
by one degree or two degrees.
• The mark on the throttle housing indicates five
degrees. Use the mark for your reference
when opening the throttle grip.