Honda crf250r 2012 Owner's Manual page 34

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 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 power and response. (page 50).
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 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 53).
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 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-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 56).
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.
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 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
27