Honda Crf250l Service Manual

3-2
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MAINTENANCE
MAINTENANCESERVICE INFORMATION
GENERAL
 • Place the motorcycle on level surface before starting any work.
 • Gasoline is extremely flammable and is explosive under certain conditions.
 • Work in a well ventilated area. Smoking or allowing flames or sp arks in the work area or where the gasoline is stored can cause
a fire or explosion.
 • The exhaust contains poisonous carbon monoxide gas that may cause loss of consciousness and may lead to death. Run the engine in an...

3-3
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MAINTENANCE
FUEL LINE
INSPECTION
Remove the right fuel tank shroud (page 2-4).
Check the quick connect fitting [1] for looseness.
Check the fuel feed hose [2] for deterioration, damage
or leakage.
Check the quick connect fitting for dirt, and clean if
necessary.
Replace the fuel pump packing if necessary (page 7-9).
THROTTLE OPERATION
Check for any deterioration or damage to the throttle
cable.
Check the throttle grip for smooth operation.
Check that the throttle opens and...

3-4
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MAINTENANCE
Major adjustment is made with the lower adjuster [1] at
the throttle body.
Loosen the lock nut [2] and turn the adjuster.
Tighten the lock nut to the specified torque while
holding the adjuster.
Recheck the throttle operation.
AIR CLEANER
REMOVAL/INSTALLATION
 • The viscous paper element cannot be cleanedbecause the element contains a dust adhesive.
 • If the motorcycle is used in unusually wet or dusty areas, more frequent inspections are required.
Remove the right...

3-5
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MAINTENANCE
Service if the
deposits level can
be seen in the air cleaner housing drain plug.Check the air cleaner housing drain plug [1].
If necessary, remove the drain plug from the air cleaner
and drain the deposits into a suitable container.
Reinstall the drain plug securely.
SPARK PLUG
REMOVAL/INSTALLATION
Disconnect the spark plug cap [1].
Clean around the
spark plug base
with compressed air
before removing the
spark plug, and be
sure that no debris
is allowed to enter
into...

3-6
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MAINTENANCE
Always use
specified spark
plugs on thismotorcycle.Replace the plug if the center electrode [1] is rounded
as shown in the illustration.
To prevent
damaging the iridium center
electrode, use a wire type feeler
gauge to check the
spark plug gap.Check the spark plug gap between the center and side
electrodes with a wire type feeler gauge [1].
Make sure that the  Φ 1.0 mm (0.039 in) plug gauge
does not insert between the gap.
If the gauge can be inserted into the gap,...

3-7
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MAINTENANCE
Make sure that the outside index lines (IN [1] and EX
[2] marks) on the cam sprockets are flush with the
cylinder head top surface and facing outward as shown.
If the IN and EX marks are facing inward, turn the
crankshaft counterclockwise one full turn (360°) and
realign the T mark with the index notch.
Check the valve clearance by inserting a feeler gauge
[1] between the rocker arm and shim.
ADJUSTMENT
 • The valve clearances can be adjusted without removing the...

3-8
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MAINTENANCE
Sixty-nine different
thickness shims are
available from the
thinnest 1.200 mm thickness shim to
the thickest 2.900
mm thickness shim in increments of
0.025 mm.Measure the shim [1] th ickness and record it.
Calculate the new shim thickness using the equation
below.
A = (B – C) + D
A: New shim thickness
B: Recorded valve clearance
C: Specified valve clearance
D: Old shim thickness
 • Make sure of the correct shim thickness by measuring the shim by micrometer.
 • Inspect...

3-9
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MAINTENANCE
ENGINE OIL
OIL LEVEL INSPECTION
Hold the motorcycle in an upright position.
Start the engine and let it idle for 3 – 5 minutes.
Stop the engine and wait 2 – 3 minutes.
Check the oil level through the inspection window.
If the level is below the lower level line [1], remove the
oil filler cap [2] and fill the crankcase with the
recommended oil up to the upper level line [3].
Check that the O-ring [4] is in good condition, replace it
if necessary.
Apply engine oil to the...

3-10
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MAINTENANCE
ENGINE OIL FILTER
REPLACEMENT
Drain the engine oil (page 3-9).
Remove the following:
– Bolts [1]
– Oil filter cover [2]
– Gasket [3]
–Spring [4]
Remove the oil filter [1].
Install a new oil filter with the OUT-SIDE mark [2]
facing out.
Installing the oil filter backwards will result in severe
engine damage.
Install the oil filter spring [3 ] into the oil filter cover [4].
Install a new gasket [5] and oil filter cover.
Install the cover bolts and tighten them.
Fill the...

3-11
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MAINTENANCE
RADIATOR COOLANT
Check the coolant level of the reserve tank with the
engine running at normal operating temperature.
The level should be between the UPPER [1] and
LOWER [2] leve l lines with the motorcycle in an
upright position.
If the level is low, remove  the reserve tank cap [3] and
fill the tank to the UPPER level line with a 1:1 mixture
of distilled water and antifreeze.
Check to see if there are any coolant leaks when the
coolant level decreases very rapidly....