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Honda CRF250X User Manual

Honda CRF250X
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Servicing Your Honda 29
Spark Plug
Some non-resistor plugs may cause ignition problems. Refer
to the recommendations elsewhere in this manual for specific
types so you will be sure to use the proper reach and heat
range. Replace periodically as specified in the Maintenance
Schedule (page 27).
Engine oil and Filter
Drain and replace the engine oil often to ensure the greatest
service life of the piston, cylinder and crankshaft.
Also replace the engine oil filter often to ensure the greatest
service life. Frequent oil changes will also assure consistent
engine of power and response. (page 44).
Air Cleaner
Clean and oil your air cleaner regularly because the volume
of air able to pass through it has a great effect on
performance. Both engine performance and long-term
durability may be affected by an air cleaner that has
deteriorated and allows dirt to pass through it. Inspect the air
cleaner closely each time it’s serviced for evidence of small
tears or seam separation. Keep a spare air cleaner oiled and
ready to install, sealed in a plastic bag. Riding in dusty
conditions may require servicing the air cleaner or replacing
it with a pre-serviced air cleaner between motos. Be careful
not to over oil the air cleaner. While it is important to oil the
air cleaner thoroughly, over oiling will cause an overall rich
running condition, probably more noticeable off idle and in
low-min
-1
(rpm) performance. Follow the servicing
instructions in the Maintenance section. Use Honda Foam
Air Filter Oil or an equivalent. Be sure to grease the air
cleaner flange where it contacts the air cleaner housing.
Honda White Lithium Grease, or an equivalent, is handy for
this because any dirt that penetrates this sealing area will
show up clearly (page 51).
Use a Honda Genuine air cleaner or an equivalent air cleaner
specified for your model.
Using the wrong Honda air cleaner or a non-Honda air
cleaner which is not of equivalent quality may cause
premature engine wear or performance problems.
Transmission Oil
Drain and replace the transmission oil often to ensure the
greatest service life of the transmission and clutch. Frequent
changes will also assure consistent shifting and clutch
performance (page 47).
Air Cleaner Housing Sealing
Remove and reseal the air cleaner housing boot where it
connects to the air cleaner housing with Hand Grip Cement
or equivalent if there is any doubt to its sealing integrity.
Inspect the air cleaner and air intake tract regularly for signs
of deterioration or dirt penetration.
General Competition Maintenance
250X_001-029.qxd 08.7.3 10:08 ページ29

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Honda CRF250X Specifications

General IconGeneral
Engine Type249cc liquid-cooled single-cylinder four-stroke
Bore and Stroke78.0mm x 52.2mm
Compression Ratio12.9:1
InductionKeihin 37mm flat-slide carburetor
IgnitionCDI
TransmissionWide-ratio five-speed
Front Suspension47mm inverted Showa cartridge fork with 16-position rebound and 16-position compression damping adjustability; 12.4 inches travel
Front BrakeSingle 240mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire100/100-18
Trail113mm (4.4 inches)
Wheelbase58.3 inches
Seat Height37.7 inches
Fuel Capacity1.9 gallons
Final Drive520 chain; 13T/51T
Rake27.5 degrees
Rear SuspensionPro-Link Showa single shock with spring preload, 17-position rebound damping adjustability, and 13-position compression damping adjustability; 12.4 inches travel
Curb Weight254 lbs (Includes all standard equipment, required fluids and a full tank of fuel—ready to ride)

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