Honda 2005 CRF450R Owner's Manual page 28

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 21).
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 37).
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 40).
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 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 rpm performance. Follow the servicing instructions in
the Maintenance section. Use Pro Honda Foam Filter Oil or
an equivalent. Be sure to grease the air cleaner flange where
it contacts the air cleaner housing. Pro Honda White
Lithium Grease, or an equivalent, is handy for this because
any dirt that penetrates this sealing area will show up clearly
(page 43).
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 housing boot where it
connects to the air cleaner housing with Pro Honda Handgrip
Cement or equivalent there is any doubt to its sealing
integrity. Inspect the air cleaner and air intake tract regularly
for signs of deterioration or dirt penetration.
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Servicing Your Honda