2007 YAMAHA YBR250 engine

5-1
5
OPERATION AND IMPORTANT RIDING POINTS
EAU15950
EWA10270
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Become thoroughly familiar
with all operating controls and
their functions before riding.
Consult a Yamaha dealer
regarding any control or function
that you do not thoroughly
understand.
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Never start the engine or operate
it in a closed area for any length
of time. Exhaust fumes are
poisonous, and inhaling them
can cause loss of
consciousness and death within
a short time. Always make sure
that there is adequate
ventilation.
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Before starting out, make sure
that the sidestand is up. If the
sidestand is not raised
completely, it could contact the
ground and distract the operator,
resulting in a possible loss of
control.
EAUW0090
Starting the engineIn order for the ignition circuit cut-off
system to enable starting, one of the
following conditions must be met:l
The transmission is in the neutral
position.
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The transmission is in gear with the
clutch lever pulled and the
sidestand up.
EWA10290
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Before starting the engine, check
the function of the ignition
circuit cut-off system according
to the procedure described on
page 3-12.
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Never ride with the sidestand
down.
1. Turn the key to “ON” and make sure
that the engine stop switch is set
to “
”.
ECAW0041
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The engine trouble warning light
should come on for a few
seconds, then go off. If the warning light does not go off,
ask a Yamaha dealer to check the
motorcycle.
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The speedometer needle will
sweep across the speed range
and then return to zero. The
tachometer needle will sweep
across the r/min range and then
return to zero. If either needle
does not sweep across their
ranges, ask a Yamaha dealer to
check the motorcycle.
2. Shift the transmission into the
neutral position.When the transmission is in the neutral
position, the neutral indicator light should
be on, otherwise have a Yamaha dealer
check the electrical circuit.3. Start the engine by pushing thestart switch.If the engine fails to start, release the
start switch, wait a few seconds, and
then try again. Each starting attempt
should be as short as possible to
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5-2
5
OPERATION AND IMPORTANT RIDING POINTSpreserve the battery. Do not crank the
engine more than 10 seconds on any
one attempt.
ECA11040
For maximum engine life, never
accelerate hard when the engine is
cold!The engine is warm when it quickly
responds to the throttle.
EAU16671
ShiftingShifting gears lets you control the
amount of engine power available for
starting off, accelerating, climbing hills,
etc.
The gear positions are shown in the
illustration.
1 2 3 4 5
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1. Shift pedal
2. Neutral positionTo shift the transmission into the neutral
position, press the shift pedal down
repeatedly until it reaches the end of its
travel, and then slightly raise it.
ECA10260
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Even with the transmission in
the neutral position, do not coast
for long periods of time with the engine off, and do not tow the
motorcycle for long distances.
The transmission is properly
lubricated only when the engine
is running. Inadequate
lubrication may damage the
transmission.
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Always use the clutch while
changing gears to avoid
damaging the engine,
transmission, and drive train,
which are not designed to
withstand the shock of forced
shifting.
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5-3
5
OPERATION AND IMPORTANT RIDING POINTS
EAU16810
Tips for reducing fuel
consumptionFuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:l
Shift up swiftly, and avoid high
engine speeds during acceleration.
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Do not rev the engine while shifting
down, and avoid high engine
speeds with no load on the engine.
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Turn the engine off instead of letting
it idle for an extended length of time
(e.g., in traffic jams, at traffic lights
or at railroad crossings).
EAU16841
Engine break-inThere is never a more important period
in the life of your engine than the period
between 0 and 1600 km (1000 mi). For
this reason, you should read the
following material carefully.
Since the engine is brand new, do not
put an excessive load on it for the first
1600 km (1000 mi). The various parts in
the engine wear and polish themselves
to the correct operating clearances.
During this period, prolonged full-throttle
operation or any condition that might
result in engine overheating must be
avoided.
EAU17100
0-1000 km (0-600 mi)
Avoid prolonged operation above 5000
r/min.
1000-1600 km (600-1000 mi)
Avoid prolonged operation above 6000
r/min.
ECA11150
After 1000 km (600 mi) of operation,
the engine oil must be changed, and
the oil filter element replaced.
1600 km (1000 mi) and beyond
The vehicle can now be operated
normally.
ECA10310
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Keep the engine speed out of the
tachometer red zone.
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If any engine trouble should
occur during the engine break-
in period, immediately have a
Yamaha dealer check the vehicle.
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5-4
5
OPERATION AND IMPORTANT RIDING POINTS
EAU17212
ParkingWhen parking, stop the engine, and then
remove the key from the main switch.
EWA10310
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Since the engine and exhaust
system can become very hot,
park in a place where
pedestrians or children are not
likely to touch them.
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Do not park on a slope or on soft
ground, otherwise the vehicle
may overturn.
ECA10380
Never park in an area where there are
fire hazards such as grass or other
flammable materials.
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6-7
6
PERIODIC MAINTENANCE AND MINOR REPAIR
1. Remove the seat. (See page 3-9.)
2. Remove the screws, and then pullthe panel to the outside as shown.To install the panel1. Place the panel in the original position, and install the screws.
2. Install the seat.
EAU19630
Checking the spark plugl
The spark plug is an important
engine component, which is easy
to check. Since heat and deposits
will cause any spark plug to slowly
erode, the spark plug should be
removed and checked in
accordance with the periodic
maintenance and lubrication chart.
In addition, the condition of the
spark plug can reveal the condition
of the engine.
To remove the spark plug 1. Remove cowling. (See page 6-6.)
1. Spark plug cap2. Remove the spark plug cap.
3. Remove the spark plug as shown, with the spark plug wrench included
in the owner’s tool kit.
1. Spark plug wrenchTo check the spark plug1. Check that the porcelain insulator around the center electrode of the
spark plug is a medium-to-light tan
(the ideal color when the
motorcycle is ridden normally).If the spark plug shows a distinctly
different color, the engine could be
defective. Do not attempt to diagnose
such problems yourself. Instead, have
a Yamaha dealer check the motorcycle.2. Check the spark plug for electrodeerosion and excessive carbon or
other deposits, and replace it if
necessary.
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6-8
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PERIODIC MAINTENANCE AND MINOR REPAIRSpecified spark plug:NGK / DR8EATo install the spark plug
1. Measure the spark plug gap with a wire thickness gauge and, if
necessary, adjust the gap to
specification.1. Spark plug gapSpark plug gap:0.6~0.7mm (0.024-0.028 in)2. Clean the surface of the spark plug
gasket and its mating surface, and
then wipe off any grime from the
spark plug threads.
3. Install the spark plug with the spark plug wrench, and then
tighten it to the specified torque. Tightening torque:
Spark plug:17.5 Nm (1.75 m.kgf, 13 ft.lbt)
If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4-1/2 turn past
finger tight. However, the spark plug
should be tightened to the specified
torque as soon as possible.4. Install the spark plug cap.
5. Install the cowling.
EAU37801
Engine oil and oil filter
elementThe engine oil level should be checked
before each ride. In addition, the oil must
be changed and the oil filter element
replaced at the intervals specified in the
General periodic maintenance and
lubrication chart.
To check the engine oil level 1. Place the vehicle on a level surface and hold it in an upright
position.Make sure that the vehicle is positioned
straight up when checking the oil level.
A slight tilt to the side can result in a
false reading.2. Start the engine, warm it up forseveral minutes, and then turn it
off.
3. Wait a few minutes until the oil settles, and then check the oil level
through the check window located
at the bottom-right side of the
crankcase.
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6-9
6
PERIODIC MAINTENANCE AND MINOR REPAIR
The engine oil should be between the
minimum and maximum level marks.
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1. Engine oil filler cap
2. Maximum level mark
3. Minimum level mark4. If the engine oil is below the minimum level mark, add sufficient
oil of the recommended type to
raise it to the correct level.
To change the engine oil (with or
without oil filter element
replacement) 1. Start the engine, warm it up for several minutes, and then turn it
off.
2. Place an oil pan under the engine to collect the used oil.
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1. Dipstick3. Remove the engine oil filler bolt anddrain bolt to drain the oil from the
crankcase.
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1. Engine oil drain boltCheck the washer for damage and
replace it if necessary.
4. Remove the oil filter element drainbolt to drain the oil from the oil filter
element.Skip steps 5-7 if the oil filter element is
not being replaced.5. Remove the oil filter element coverby removing the bolts.1. Oil filter element cover bolts
2. Oil filter element drain bolt6. Remove and replace the oil filterelement and O-rings.
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6-10
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PERIODIC MAINTENANCE AND MINOR REPAIR
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1. Oil filter element
2. O-ringMake sure that the O-rings are properly
seated.7. Install the oil filter element coverby installing the bolts, then
tightening them to the specified
torque.Tightening torque:Oil filter element cover bolt: 10 Nm (1,0 m.kgf, 7.4 ft.lbf)8. Install the engine oil drain bolt, and
then tighten it to the specified
torque.
9. Install the oil filter element drain bolt, and then tighten it to the
specified torque.
Tightening torque:Engine oil drain bolt: 20 Nm (2.0 m.kgf, 15 ft.lbf)
Oil filter element drain bolt: 7 Nm (0.7 m.kgf, 5.25 ft.lbf)10. Add the specified amount of the
recommended engine oil, and then
install and tighten the oil filler bolt.Recommended engine oil:See page 8-1
Oil quantity: Without oil filter element
replacement:1.35 L (1.43 US qt) (1.19
Imp.qt)
With oil filter element replacement:1.45 L (1.53 US qt) (1.28
Imp.qt)
ECA11620
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In order to prevent clutch
slippage (since the engine oil
also lubricates the clutch), do not
mix any chemical additives. Do
not use oils with a diesel
specification of “CD” or oils of a
higher quality than specified. In addition, do not use oils labeled
“ENERGY CONSERVING II” or
higher.
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Make sure that no foreign
material enters the crankcase.
11. Start the engine, and then let it idle
for several minutes while checking
it for oil leakage. If oil is leaking,
immediately turn the engine off and
check for the cause.
12. Turn the engine off, and then check the oil level and correct it if
necessary.
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