Basic Operating Instructions
15
Starting & Stopping the Engine
Always follow the proper starting procedure
described below.
Your CRF can be started with the transmission
in gear by pulling in the clutch lever before
operating the kickstarter or start button.
Preparation
Make sure that the transmission is in neutral.
Fuel Valve
ON
OFF
RES
(1)
(1) fuel valve
The three-way fuel valve is used to control the
flow of fuel from the fuel tank to the carburetor.
ON
–Turning the fuel valve ON before attempting
to start the engine allows fuel to flow from the
fuel tank to the carburetor.
OFF
–Turning the fuel valve OFF prevents the
flow of fuel from the fuel tank to the carburetor.
RES
–Turning the fuel valve to RES allows
fuel to flow from the reserve fuel supply to the
carburetor.
Starting Procedure
Always follow the proper starting procedure
described as follow.
(1)
(2)
ON
OFF
(1) fuel valve
(2) choke knob
Check the engine oil, transmission oil and
coolant levels before starting the engine (pages
44, 47, 48).
To restart a warm engine, follow the procedure
for ‘‘High Air Temperature.”
Normal Air Temperature 10°C – 35°C (50°F – 95°F)
1. Turn the fuel valve (1) ON.
2. Pull the choke knob (2) fully ON, if the
engine is cold.
3. Keep the throttle fully closed.
4. Pull the clutch lever all the way in, and depress
the start button. Or operate the kickstarter
to start the engine. Starting from the top of
the stroke, kick through to the bottom with a
rapid, continuous motion. Do not operate the
throttle.
NOTICE
Allowing the kickstarter to snap back freely
against the pedal stop can damage the engine
case.
5. Warm up the engine; don’t operate the
throttle.
6. About 15 seconds after the engine starts, push
the choke knob back all the way to fully OFF.
If idling is unstable, open the throttle slightly.
NOTICE
Extended use of the choke may impair piston and
cylinder wall lubrication and damage the engine.
High Air Temperature 35°C (95°F) or above
1. Turn the fuel valve ON.
2. Do not use the choke.
3. Keep the throttle fully closed.
4. Start the engine following step 4 under
“Normal Air Temperature.”
Low Air Temperature 10°C (50°F) or below
1. If the temperature is below 0°C (32°F), open
the throttle two or three times. (The engine
requires a richer mixture for starting in cold
weather. When the throttle is so opened, the
accelerator pump will feed extra fuel to the
cylinder, thereby facilitating starting in cold
weather.)
2. Follow steps 1 – 4 under “Normal Air
Temperature.”
3. Continue warming up the engine until it runs
smoothly and responds to the throttle when
the choke knob is pushed back all the way to
fully OFF.
NOTICE
Extended use of the choke may impair piston and
cylinder wall lubrication and damage the engine.
17 CRF450X̲31MEY710.indb 15
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2016/06/08 11:45:33
