Yamaha YZ250 2021, Owner'S Manual

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PRE-OPERATION INSPECTION AND MAINTENANCE
3-4
EAM20134
PRE-OPERATION INSPECTION AND MAINTENANCE
Before riding for break-in operation, practice or a race, make sure the machine is in good operating con-
dition.
Before using this machine, check the following points.
EAM30209
GENERAL INSPECTION AND MAINTENANCE
TIP
Perform usual maintenance enough so that, in the race course, a confirmation of that and simple setting
adjustments may only be left, in order to get enough time to use effectively.
Item Inspect Page
Coolant
Check that coolant is filled up to the radiator cap.
Check the cooling system for leakage.
3-10, 3-11, 3-11
Fuel
Check that a fresh gasoline is filled in the fuel tank.
Check the fuel line for leakage.
1-11
Transmission oil
Check that the oil level is correct. Check the crankcase for
leakage.
3-6, 3-6
Gear shifter and clutch
Check that gears can be shifted correctly in order and that
the clutch operates smoothly.
3-7, 3-8
Throttle grip/Housing
Check that the throttle grip operation and free play are cor-
rectly adjusted. Lubricate the throttle grip and housing, if
necessary.
3-5, 3-24
Brakes
Check the play of front brake and effect of front and rear
brake.
3-13, 3-13, 3-14,
3-14, 3-15, 3-15,
3-15, 3-15
Drive chain
Check drive chain slack and alignment. Check that the
drive chain is lubricated properly.
3-16, 4-29, 4-29,
4-31, 4-31, 4-31
Wheels
Check for excessive wear and tire pressure. Check for
loose spokes and have no excessive play.
3-23, 3-23, 3-24
Steering
Check that the handlebar can be turned smoothly and have
no excessive play.
3-17
Front forks and rear
shock absorber
Check that they operate smoothly and there is no oil leak-
age.
3-18, 3-19, 3-20,
3-21, 3-23
Cables (wires)
Check that the clutch and throttle cables move smoothly.
Check that they are not caught when the handlebars are
turned or when the front forks travel up and down.
—
Exhaust pipe
Check that the exhaust pipe is tightly mounted and has no
cracks.
3-9
Rear wheel sprocket
Check that the rear wheel sprocket tightening bolt is not
loose.
4-3, 4-3, 4-3
Lubrication Check for smooth operation. Lubricate if necessary.
3-24, 3-24, 3-24,
3-24
Bolts and nuts Check the chassis and engine for loose bolts and nuts. 1-14
Lead connectors
Check that the stator coil assembly, ECU and ignition coil
are connected tightly.
—
Settings
Is the machine set suitably for the condition of the racing
course and weather or by taking into account the results of
test runs before racing? Are inspection and maintenance
completely done?
8-9, 8-9, 8-9, 8-10,
8-10, 8-11, 8-11,
8-12, 8-12, 8-14,
8-15