Starting And Break-In; Fuel; Handling Note; Starting A Cold Engine - Yamaha WR450F 2021 Owner's Service Manual

EAM20123

STARTING AND BREAK-IN

EAM30193

FUEL

Always use the recommended fuel as stated be-
low. Also, be sure to use new gasoline the day
of a race.
Recommended fuel
Premium unleaded gasoline
(E10 acceptable)
Fuel tank capacity
7.9 L (2.1 US gal, 1.7 Imp.gal)
Fuel reserve amount
2.0 L (0.53 US gal, 0.44 Imp.gal)
ECA24180
NOTICE
Use only unleaded gasoline. The use of lead-
ed gasoline will cause severe damage to the
engine internal parts such as valves, piston
rings, and exhaust system, etc.
TIP
Your Yamaha engine has been designed to use
premium unleaded gasoline with a pump octane
number [(R+M)/2] of 91 or higher, or a research
octane number of 95 or higher. If knocking (or
pinging) occurs, use a gasoline of a different
brand.
EWA19010
WARNING
• For refueling, be sure to stop the engine
and use enough care not to spill any fuel.
Also be sure to avoid refueling close to a
fire.
• Refuel after the engine, exhaust pipe, etc.
have cooled off.
Gasohol
There are two types of gasohol: gasohol con-
taining ethanol and that containing methanol.
Gasohol containing ethanol can be used if the
ethanol content does not exceed 10 %. Gasohol
containing methanol is not recommended by
Yamaha because it can cause damage to the
fuel system or vehicle performance problems.
EAM30194

HANDLING NOTE

EWA19020
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-
STARTING AND BREAK-IN
chine in a well-ventilated area.
ECA25910
NOTICE
• 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.
EAM30196

STARTING A COLD ENGINE

1. Press the shift pedal to neutral.
2. Push the starter knob "1" completely.
TIP
• When the ambient temperature is 15 C (59 F)
or below, use the starter knob.
• Do not operate the throttle grip when operating
the starter knob.
3. Start the engine by pushing the start switch.
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.
4. When the engine starts running, warm this up
one or two minutes at a steady speed (of
3000 to 5000 r/min), and then return the start-
er knob to its original position.
TIP
When operating the throttle grip in the closing di-
rection, the starter knob "1" moves in the direc-
tion as shown and returns to its original position.
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