For your safety – pre-operation checks
4-1
4
EAU63440
Inspect your vehicle each time you use it to make sure the vehicle is in safe oper-
ating condition. Always follow the inspection and maintenance procedures and
schedules described in the Owner’s Manual.
WARNING
EWA11152
Failure to inspect or maintain the vehicle properly increases the possibility
of an accident or equipment damage. Do not operate the vehicle if you find
any problem. If a problem cannot be corrected by the procedures provided
in this manual, have the vehicle inspected by a Yamaha dealer.
Before using this vehicle, check the following points:
ITEM CHECKS PAGE
Fuel• Check fuel level in fuel tank.
• Refuel if necessary.
• Check fuel line for leakage.
• Check fuel tank overflow hose for obstructions, cracks
or damage, and check hose connection.3-12,
3-14
Engine oil• Check oil level in engine.
• If necessary, add recommended oil to specified level.
• Check vehicle for oil leakage.6-9
Final transmission oil• Check vehicle for oil leakage. 6-11
Coolant• Check coolant level in reservoir.
• If necessary, add recommended coolant to specified
level.
• Check cooling system for leakage.6-12
Front brake• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage.6-21,
6-22
Rear brake• Check operation.
• If soft or spongy, have Yamaha dealer bleed hydraulic
system.
• Check brake pads for wear.
• Replace if necessary.
• Check fluid level in reservoir.
• If necessary, add specified brake fluid to specified level.
• Check hydraulic system for leakage.6-21,
6-22
Throttle grip• Make sure that operation is smooth.
• Check throttle grip free play.
• If necessary, have Yamaha dealer adjust throttle grip
free play and lubricate cable and grip housing.6-16,
6-24
UBR7E0E0.book Page 1 Tuesday, October 25, 2016 2:44 PM
Periodic maintenance and adjustment
6-10
6 4. If the engine oil is not between the
tip of the dipstick and the maxi-
mum level mark, add sufficient oil
of the recommended type to raise
it to the correct level.
5. Check the O-ring for damage, and
replace it if necessary.
6. Insert the dipstick into the oil filler
hole, and then tighten the oil filler
cap.
To change the engine oil and clean
the oil strainer
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.
3. Remove the engine oil filler cap
and engine oil drain bolts A and B
to drain the oil from the crankcase.
NOTICE: When removing the
engine oil drain bolt B, the O-
ring, compression spring, and
oil strainer will fall out. Take
care not to lose these parts.
[ECAT1022]
4. Clean the engine oil strainer with
solvent, and then check it for dam-
age and replace it if necessary.
5. Install the engine oil strainer, com-
pression spring, new O-ring and
engine oil drain bolt B.
TIP
Make sure that the O-ring is properly
seated.
6. Install engine oil drain bolt A and
its new gasket, and then tighten
both drain bolts to their specified
torques.
7. Refill with the specified amount of
the recommended engine oil.
1. Engine oil filler cap
2. O-ring
3. Engine oil dipstick
4. Maximum level mark
5. Tip of the engine oil dipstick
1
3
2
4
5
1. Engine oil drain bolt A
2. Gasket
3. Oil strainer
4. Compression spring
5. O-ring
6. Engine oil drain bolt B
Tightening torque:
Engine oil drain bolt A:
20 N·m (2.0 kgf·m, 14 lb·ft)
Engine oil drain bolt B:
32 N·m (3.2 kgf·m, 23 lb·ft)
Recommended engine oil:
See page 8-1.
Oil quantity:
0.90 L (0.95 US qt, 0.79 Imp.qt)
1
3
4
5
6
2
UBR7E0E0.book Page 10 Tuesday, October 25, 2016 2:44 PM
Periodic maintenance and adjustment
6-12
6 6. Install the final transmission oil
drain bolt and its new gasket, and
then tighten the bolt to the speci-
fied torque.
7. Refill with the specified amount of
the recommended final transmis-
sion oil. WARNING! Make sure
that no foreign material enters
the final transmission case.
Make sure that no oil gets on
the tire or wheel.
[EWA11312]
8. Install the final transmission oil fill-
er cap and its new O-ring, and
then tighten the oil filler cap.
9. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
EAU20071
Coolant
The coolant level should be checked
before each ride. In addition, the cool-
ant must be changed at the intervals
specified in the periodic maintenance
and lubrication chart.
EAU40047To check the coolant level
1. Place the vehicle on the center-
stand.
TIP
zThe coolant level must be
checked on a cold engine since
the level varies with engine tem-
perature.
zMake sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to the
side can result in an incorrect
reading.
2. Check the coolant level in the
coolant reservoir.
TIP
The coolant should be between the
minimum and maximum level marks.
1. Final transmission oil drain bolt
2. Gasket
Tightening torque:
Final transmission oil drain bolt:
20 N·m (2.0 kgf·m, 14 lb·ft)
Recommended final transmission
oil:
See page 8-1.
Oil quantity:
0.15 L (0.16 US qt, 0.13 Imp.qt)
12
1. Coolant reservoir cap
2. Coolant reservoir
3. Maximum level mark
4. Minimum level mark
34
2
1
UBR7E0E0.book Page 12 Tuesday, October 25, 2016 2:44 PM
Periodic maintenance and adjustment
6-16
6 damaging the air filter element,
handle it gently and carefully,
and do not twist it.
[ECA10522]
4. Apply oil of the recommended
type to the entire surface of the
sponge material, and then
squeeze the excess oil out.
TIP
zThe air filter element should be
wet but not dripping.
zCheck the air filter element for ex-
cessive dirt or damage and re-
place it if necessary.
5. Insert the element into the V-belt
case.
6. Install the air filter element cover
by installing the screws.
EAU21386
Checking the throttle grip free
play
Measure the throttle grip free play as
shown.
Periodically check the throttle grip free
play and, if necessary, have a Yamaha
dealer adjust it.
1. V-belt case air filter element
Recommended oil:
Yamaha foam air filter oil or other
quality foam air filter oil
1
1. Throttle grip free play
Throttle grip free play:
3.0–7.0 mm (0.12–0.28 in)
1
UBR7E0E0.book Page 16 Tuesday, October 25, 2016 2:44 PM
Specifications
8-1
8
Dimensions:
Overall length:
1980 mm (78.0 in)
Overall width:
750 mm (29.5 in)
Overall height:
1210 mm (47.6 in)
Seat height:
780 mm (30.7 in)
Wheelbase:
1350 mm (53.1 in)
Ground clearance:
125 mm (4.92 in)
Minimum turning radius:
2.5 m (8.20 ft)
Weight:
Curb weight:
159 kg (351 lb) (MWS125-C)
164 kg (362 lb) (MWS125-A)
Engine:
Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train:
SOHC
Number of cylinders:
Single cylinder
Displacement:
125 cm³
Bore × stroke:
52.0 × 58.7 mm (2.05 × 2.31 in)
Compression ratio:
11.2 : 1
Starting system:
Electric starter
Lubrication system:
Wet sump
Engine oil:
Recommended brand:
YAMALUBE
SAE viscosity grades:
10W-40
Recommended engine oil grade:
API service SG type or higher, JASO
standard MA or MB
Engine oil quantity:
Oil change:
0.90 L (0.95 US qt, 0.79 Imp.qt)
Final transmission oil:
Type:
Motor oil SAE 10W-30 type SE or higher or
Gear oil SAE 85W GL-3
Quantity:
0.15 L (0.16 US qt, 0.13 Imp.qt)
Coolant quantity:
Coolant reservoir (up to the maximum level
mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
Radiator (including all routes):
0.46 L (0.49 US qt, 0.40 Imp.qt)
Air filter:
Air filter element:
Oil-coated paper element
Fuel:
Recommended fuel:
Regular unleaded gasoline (Gasohol [E10]
acceptable)
Fuel tank capacity:
7.2 L (1.9 US gal, 1.6 Imp.gal)
Fuel injection:
Throttle body:
ID mark:
BR71 00
Spark plug(s):
Manufacturer/model:
NGK/CPR8EA-9
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Clutch:
Clutch type:
Dry, centrifugal, shoe
Drivetrain:
Primary reduction ratio:
1.000
Final drive:
Gear
Secondary reduction ratio:
10.208 (56/16 x 35/12)
Transmission type:
V-belt automatic
Chassis:
Frame type:
Underbone
Caster angle:
20.0 °
Trail:
67 mm (2.6 in)
UBR7E0E0.book Page 1 Tuesday, October 25, 2016 2:44 PM