Honda Crf 250 M Manual

Servicing Your Honda37
Engine Oil
JASO T 903 standard
The JASO T 903 standard is an index to choose
engine oils for 4-stroke motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard has the following
classification on the oil container.
(1) code number of the sales company of the oil
(2) oil classification
Checking & Adding Oil
(1) engine oil filler cap/dipstick
(2) upper level mark
(3) lower level mark
1. Run the engine at idle for 3 minutes, then shut
it off.  
2. Wait 3...

38Servicing Your Honda
Engine Oil
8.  Remove the left engine guard bolt (4) and left
engine guard (5).12.Apply grease to the seat face of spring (10).
13.Position the spring against the engine
crankcase and install a new oil filter with the
rubber seal (11) facing out, away from the
engine. You should see the ”OUT-SIDE” mark
(12) on the filter body, near the seal.
Use a new genuine Honda oil filter or a filter
of equal quality specified for your model.
If the oil filter is not installed properly, it...

Servicing Your Honda39
Refer to Safety Precautions on page19.  
Using the proper oil, and regularly checking,
adding, and changing oil will help extend the
service life of the transmission and clutch.  Even
the best oil wears out.  Changing oil helps get rid
of dirt and deposits.  Operating the engine with
old or dirty oil can damage your engine.
Running the engine with insufficient oil can
cause serious damage to the engine and
transmission.  Oil Recommendation• Your CRF does not need oil additives. Use...

40Servicing Your Honda
JASO T 903 standard
The JASO T 903 standard is an index to choose
engine oils for 4-stroke motorcycle engines.
There are two classes: MA and MB.
Oil conforming to the standard has the following
classification on the oil container.
(1) code number of the sales company of the oil
(2) oil classification
Checking & Adding Oil
(1) transmission oil filler cap
(2) oil check bolt
1. Run the engine at idle for 3 minutes, then shut
it off.  
2. Wait 3 minutes after shutting off the engine...

Servicing Your Honda41
Your CRF’s liquid cooling system dissipates
engine heat through the coolant jacket that
surrounds the cylinder and cylinder head.  
Maintaining the coolant will allow the cooling
system to work properly and prevent freezing,
overheating, and corrosion.  
Coolant Recommendation
Use Pro Honda HP coolant or an equivalent high
quality ethylene glycol antifreeze containing 
corrosion protection inhibitors specifically 
recommended for use in aluminum engines.
Check the antifreeze...

42Servicing Your Honda
Cooling System Inspection
1. Check the cooling system for leaks (see the
Honda Service Manual for troubleshooting of
leaks).  
2. Check water hoses (1) for cracks,
deterioration, and clamp bands for looseness.  
3. Check the radiator mount for looseness.  
4. Make sure the overflow tube (2) is connected
and not clogged.  
5. Check the radiator fins for clogging.  
6. Check the water leakage check hole (3) below
the water pump cover (4) for leakage.  Make
sure the hole remains open....

Servicing Your Honda43
Air Cleaner
Refer to Safety Precautionson page 19.  
The air cleaner uses polyurethane inner and outer
pieces which can’t be separated.  
A dirty air cleaner will reduce engine power.  
Proper air cleaner maintenance is very important
for off-road vehicles.  A dirty, water-soaked,
worn-out, or defective air cleaner will allow dirt,
dust, mud, and other impurities to pass into the
engine.  
Service the air cleaner more frequently if you
ride in unusually wet or dusty areas.  Your...

44Servicing Your Honda
Air Cleaner
Improper installation of the air cleaner assembly
may allow dirt and dust to enter the engine and
cause rapid wear of the piston rings and cylinder.  
12.Reinstall the seat (page 29), making sure it is
securely attached.
NOTICE9.  Apply a thin coat of Honda White Lithium
Grease to the sealing surface. 
(1) air cleaner retaining bolt
(2) two access top tabs
(3) air cleaner
(4) ”
∆” mark
(9) set tab
(2)(4)
(9)
(3)(1)
(8)(6)
(3)(1)
(7)
(5)
11.Install the assembly into the...

Crankcase Breather
Servicing Your Honda45
Refer to Safety Precautionson page 19.
Service more frequently if your CRF is ridden in
the rain or often at full throttle.
Service the breather if you can see deposits in the
transparent section of the drain tube.
Draining
1. Remove the crankcase breather tube plug (1)
from the tube (2) and drain deposits.
2. Reinstall the crankcase breather tube plug. 
(1) crankcase breather tube plug
(2) tube
(2)
(1) 

46Servicing Your Honda
Throttle
Refer to Safety Precautionson page 19.
Throttle Freeplay
(1) freeplay
Inspection
Check freeplay (1).
Freeplay: 
1/8 - 3/16 in (3 - 5 mm)
If necessary, adjust to the specified range.
Upper 
Adjustment
Minor adjustments are generally made with the
upper adjuster.Lower 
Adjustment
The lower adjuster is used for major freeplay
adjustment, such as after replacing the throttle
cables or removing the carburetor.  It is also used
if you can not get the proper adjustment with the...