Honda CRF250R Owner's Manual page 35

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 25).
Engine Oil and Filter
Drain and replace engine oil often to ensure the greatest
service life of the piston, cylinder and crankshaft.
Also replace engine oil filter often to ensure the greatest
service life. Frequent changes will also assure consistent
performance of power and response (page 49).
Spark Plug Cap
Install a small plastic tie-wrap around the spark plug cap to
reduce any possibility of it loosening or of water penetration.
Transmission Oil
Drain and replace transmission oil often to ensure the greatest
service life of the transmission and clutch. Frequent changes
will also assure consistent performance of both shifting and
clutch action (page 52).
General Competition Maintenance
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. 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 heats. 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
(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 56).
Use the 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.
Air Cleaner Housing Sealing
Remove and reseal the air cleaner connecting tube where it
connects to the air cleaner housing with Hand Grip Cement
or an 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.
Servicing Your Honda
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