Starting And Break-In; Fuel; Starting A Cold Engine - Yamaha YZ250F 2024 Owner's Manual

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STARTING AND BREAK-IN

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FUEL

Always use the recommended fuel as stated
below. Also, be sure to use new gasoline the
day of a race.
Recommended fuel
Unleaded gasoline (E10 accept-
able)
Octane number (R+M)/2
91 or higher
Fuel tank capacity
6.2 L (1.6 US gal, 1.4 Imp.gal)
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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.
Your Yamaha engine has been designed to use
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.
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• 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 (For Canada)
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 %. Gaso-
hol containing methanol is not recommended
by Yamaha because it can cause damage to the
fuel system or vehicle performance problems.
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STARTING A COLD ENGINE

1. Press the shift pedal to neutral.
2. Push the starter knob "1" completely.
• When the ambient temperature is 15 C (59 F)
or below, use the starter knob.
• Do not operate the throttle grip when operat-
STARTING AND BREAK-IN
ing 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
starter knob to its original position.
When operating the throttle grip in the closing
direction, the starter knob "1" moves in the di-
rection as shown and returns to its original po-
sition.
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Since exhaust gas contains harmful ingredi-
ents, do not start or warm it up at an illventi-
lated place or a closed narrow place.
5. To stop the engine, push the engine stop
switch "1".
Continue pushing the engine stop switch till the
engine comes to a full stop.
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