Yamaha yz250 2015, Owner'S Manual

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1-14
MAINTENANCE AFTER BREAK-IN
MAINTENANCE AFTER
BREAK-IN
After a break-in, perform careful
maintenance to get ready for the next
practice or race.
Refer to "PRE-OPERATION IN-
SPECTION AND MAINTENANCE"
section in the CHAPTER 3.
MAJOR MAINTENANCE
1. For the engine
• Leaks around the engine
Check for pressure leaks from the
cylinder head or the cylinder, oil
leaks from the crankcase or the
case cover, leaks from the coolant
system, and other leaks.
• Check that the cylinder, the pis-
ton, and the piston ring fit one an-
other, and that contact between
the cylinder and the piston are cor-
rect.
• Transmission oil change
Drain the oil, and check for dirt
and foreign materials such as
metal chips. (If any foreign materi-
al is mixed, disassemble and
check the transmission.)
Pour the specified amount of the
recommended oil.
• Carburetor
Disassemble the carburetor and
clean the small holes, blowing
them with compressed air.
• CDI magneto
Check for looseness in mounted
areas of the rotor and the stator.
Check that the connector is not
being disconnected.
• Silencer
Check the main body and stay for
cracks.
Check for leaks.
• Mounting bolts and nuts
Check for looseness in mounted
areas of parts, as well as engine
mounting bolts and engine brack-
ets.
2. For the chassis
• Check welds and mounted areas
of the frame, the swingarm, the
link, the bracket, and so on, for
looseness and cracks.
• Wheel (s)
Check the wheel for runout.
Check the spoke for looseness.
• Brake(s)
Check the brake disc mounting
bolt for looseness.
Check that the reservoir contains
the specified amount of brake flu-
id. Check for leaks.
• Cable
Grease and adjust cables.
• Drive chain
Lubricate the drive chain and ad-
just its tension.
• Fuel tank
Clean the inside of the fuel tank
and the fuel cock. Check for leaks.
• Suspension
Check for oil leaks in the front fork
or the rear shock absorber. Check
that the mounted conditions are
good.
• Sprocket
Check for looseness in the
sprocket mounted on the rear
wheel.
• Mounting bolts and nuts
Check mounted areas for loose-
ness.
After a break-in or before each
race, always check the points
shown in "TORQUE-CHECK
POINTS" for tightening torques
and retighten them. (Refer to
"TORQUE-CHECK POINTS".)
• Greasing and oiling
Always grease or oil the specified
points.
CLEANING AND STORAGE
CLEANING
Frequent cleaning of your machine
will enhance its appearance, maintain
good overall performance, and ex-
tend the life of many components.
1. Before washing the machine,
block off the end of the exhaust
pipe to prevent water from enter-
ing. A plastic bag secured with a
rubber band may be used for this
purpose.
2. If the engine is excessively
greasy, apply some degreaser to
it with a paint brush. Do not apply
degreaser to the chain, sprockets,
or wheel axles.
3. Rinse the dirt and degreaser off
with a garden hose; use only
enough pressure to do the job.
Do not use high-pressure washers
or steam-jet cleaners since they
cause water seepage and deterio-
ration seals.
4. After the majority of the dirt has
been hosed off, wash all surfaces
with warm water and a mild deter-
gent. Use an old toothbrush to
clean hard-to-reach places.
5. Rinse the machine off immediate-
ly with clean water, and dry all
surfaces with a soft towel or cloth.
6. Immediately after washing, re-
move excess water from the
chain with a paper towel and lubri-
cate the chain to prevent rust.
7. Clean the seat with a vinyl uphol-
stery cleaner to keep the cover
pliable and glossy.
8. Automotive wax may be applied
to all painted or chromed surfac-
es. Avoid combination cleaner-
waxes, as they may contain abra-
sives.
9. After completing the above, start
the engine and allow it to idle for
several minutes.
STORAGE
If your machine is to be stored for 60
days or more, some preventive mea-
sures must be taken to avoid deterio-
ration. After cleaning the machine
thoroughly, prepare it for storage as
follows:
1. Drain the fuel tank, fuel lines, and
the carburetor float bowl.
2. Remove the spark plug, pour a ta-
blespoon of SAE 10W-40 motor
oil in the spark plug hole, and re-
install the plug. With the engine
stop switch pushed in, kick the en-
gine over several times to coat the
cylinder walls with oil.
3. Remove the drive chain, clean it
thoroughly with solvent, and lubri-
cate it. Reinstall the chain or store
it in a plastic bag tied to the frame.
4. Lubricate all control cables.
5. Block the frame up to raise the
wheels off the ground.
6. Tie a plastic bag over the exhaust
pipe outlet to prevent moisture
from entering.
7. If the machine is to be stored in a
humid or salt-air environment,
coat all exposed metal surfaces
with a film of light oil. Do not apply
oil to rubber parts or the seat cov-
er.
Make any necessary repairs before
the machine is stored.