Fuel System
44 Servicing Your Honda
Fuel System
Refer to Safety Precautions on page 27.
Use only unleaded fuel in your CRF. If you ride
your CRF in a country where leaded fuel might be
available, take precautions to use only unleaded
fuel.
Your engine is designed to use any unleaded petrol
that has a pump octane number (R + M)/2 of 91 or
higher, or a research octane number of 95 or
higher. Petrol pumps at service stations normally
display the pump octane number. For information
on the use of Petrol Containing Alcohol, see page
157.
Use of lower octane petrol can cause persistent
“pinging” or “spark knock” (a louder rapping
noise) which, if severe, can lead to engine damage.
(Light pinging experienced while operating under
a heavy load, such as climbing a hill, is no cause
for concern.)
If pinging or spark knock occurs at a steady engine
speed under normal load, change brands of petrol.
If pinging or spark knock persists, consult your
Honda dealer.
Never use stale or contaminated petrol. Avoid
getting dirt, dust or water in the fuel tank.
1. To open the fuel fill cap (1), pull the breather
tube (2) out of the steering stem nut (3). Turn
the fuel fill cap counterclockwise and remove
it.
2. Add fuel until the level reaches the bottom of
the filler neck.
Fuel Tank Capacity:
5.7ℓ (1.51 US gal, 1.25 Imp gal)
Be careful not to damage the fuel pump while
filling the fuel tank.
Avoid overfilling the tank. There should be no fuel
in the filler neck.
3. Close the fuel fill cap and insert the breather
tube in the steering stem nut.
1. Hang the fuel tank to the left side of the frame
(page 38).
2. Remove the fuel quick connect fitting cover
(1).
3. Check the fuel line (2) for cracks,
deterioration, damage or leakage. Replace the
fuel line, if necessary.
Fuel
Type Unleaded
Research Octane Number 95 (or higher)
Refueling Procedure
(1) fuel fill cap (3) steering stem nut
(2) breather tube
Petrol is highly flammable and explosive.
You can be burned or seriously injured
when handling fuel.
• Stop the engine and keep heat, sparks
and flame away.
• Handle fuel only outdoors.
• Wipe up spills immediately.
Fuel Line
(1) fuel quick connect fitting cover
(2) fuel line
CRF450R.book Page 44 Thursday, July 8, 2010 9:34 AM
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