Preoperation Checks - Yamaha YTZ250S 1986 Service Manual

PREOPERATION CHECKS
Before riding for break-in operation, practice
or a race, make sure the machine is in good
operating condition.
INSPECTION AND MAINTENANCE
Cooling water
Check that water is filled up to the radiator
filler cap.
Fuel
Check that a fresh mixture of oil and gasoline
is filled in the fuel tank.
WARNING:
Do not overfill the fuel tank. Avoid spill-
ing fuel on the hot engine.
Do not fill the fuel tank all the way to the
top or it may overflow when the fuel heats
up later and expands.
After refueling, make sure the tank cap is
closed securely.
Gear oil
Check that the gear oil level is correct.
Gear shifter and clutch
Check that gears can be shifted correctly in
order and that the clutch operates smoothly.
Brakes
Check the play of both front and rear brakes
and their braking effect.
Chain
Check chain tension and alignment. Check
that the chain is lubricated properly.
Wheels
Is the tire pressure correct?
Check for excessive wear.
Steering
Check that the handlebars can be turned
smoothly and have no excessive play.
1-15
Front forks and rear shock
Check that they operate smoothly and there is
no oil leakage.
Cables (Wires)
Check that the clutch, brake 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.
Muffler
Check that the muffler is tightly mounted and
has no cracks.
Sprocket
Check that the rear wheel sprocket tightening
bolt is not loose.
Bolts and nuts
Check the chassis and engine for loose bolts
and nuts.
Fuel, oil and coolant
Check the fuel tank, fuel cock, carburetor,
engine bottom, and . . cooling system for
leakage.
Lead wire connectors
Check that the CDI magneto, CDI unit, and ig-
nition coil are connected tightly.
Settings
Is the machine set suitably for the condition of
the racing course and weather or by taking in-
to account the results of test-runs before rac-
ing? Is inspection and maintenance complete-
ly done?
*
The machine should be checked and
serviced regularly so that only a simple,
minor adjustment of settings is required
prior to a race.