2020 YAMAHA MT-03 cooling

For your safety – pre-operation checks
4-1
4
EAU63441
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 breather hose and overflow hose for
obstructions, cracks or damage, and check hose con-
nections.3-15,
3-16
Engine oil• Check oil level in engine.
• If necessary, add recommended oil to specified level.
• Check vehicle for oil leakage.6-8
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.6-20,
6-21
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.6-20,
6-21
Clutch• Check operation.
• Lubricate cable if necessary.
• Check lever free play.
• Adjust if necessary.6-18
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Periodic maintenance and adjustment
6-5
6
14*Steering bearings• Check bearing assemblies for
looseness.√√ √
• Moderately repack with lithium-
soap-based grease.√√
15*Chassis fasteners• Make sure that all nuts, bolts
and screws are properly tight-
ened.√√√√√
16Brake lever pivot
shaft• Lubricate with silicone grease.√√√√√
17Brake pedal pivot
shaft• Lubricate with lithium-soap-
based grease.√√√√√
18Clutch lever pivot
shaft• Lubricate with lithium-soap-
based grease.√√√√√
19Shift pedal pivot
shaft• Lubricate with lithium-soap-
based grease.√√√√√
20 Sidestand• Check operation.
• Lubricate with lithium-soap-
based grease.√√√√√
21*Sidestand switch• Check operation and replace if
necessary.√√√√√√
22*Front fork• Check operation and for oil
leakage.
• Replace if necessary.√√√√
23*Shock absorber
assembly• Check operation and for oil
leakage.
• Replace if necessary.√√√√
24 Engine oil• Change (warm engine before
draining).
• Check oil level and vehicle for
oil leakage.At the initial interval and
when the oil change indi-
cator flashes or comes
on.√
25En
gine oil filter
cartridge• Replace.√√√
26*Cooling system• Check coolant level and vehicle
for coolant leakage.√√√√√
• Change. Every 3 years
27*Front and rear
brake switches• Check operation.√√√√√√ NO. ITEM
X 1000 km CHECK OR
MAINTENANCE JOB
X 1000 mi
ODOMETER
READINGS
ANNUAL CHECK
110203040
0.66121824
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Periodic maintenance and adjustment
6-12
6
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.
EAU38176To check the coolant level
1. Place the vehicle on a level sur-
face and hold it in an upright posi-
tion.
TIP
The coolant level must be
checked on a cold engine since
the level varies with engine tem-
perature.
Make sure that the vehicle is posi-
tioned straight up when checking
the coolant level. A slight tilt to the
side can result in a false reading.
2. Check the coolant level in the
coolant reservoir.
TIP
The coolant should be between the
minimum and maximum level marks.
3. If the coolant is at or below the
minimum level mark, remove the
coolant reservoir cover by remov-
ing the bolts, remove the coolant
reservoir cap, and then add cool-
ant to the maximum level mark.
WARNING! Remove only the
coolant reservoir cap. Never at-
tempt to remove the radiator
cap when the engine is hot.
[EWA15162] NOTICE: If coolant is not
available, use distilled water or
soft tap water instead. Do not
use hard water or salt water
since it is harmful to the engine.
If water has been used instead
of coolant, replace it with cool-
ant as soon as possible, other-
wise the cooling system will not
be protected against frost and
corrosion. If water has been
added to the coolant, have a
Yamaha dealer check the anti-
freeze content of the coolant as
soon as possible, otherwise the
effectiveness of the coolant will
be reduced.
[ECA10473]
1. Maximum level mark
2. Minimum level mark
3. Coolant reservoir
1
2
3
1. Bolt
2. Coolant reservoir cover
2
1
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Periodic maintenance and adjustment
6-37
6
EAU86430Engine overheating
WARNING
EWAT1041
Do not remove the radiator cap when the engine and radiator are hot.
Scalding hot fluid and steam may be blown out under pressure, which
could cause serious injury. Be sure to wait until the engine has cooled.
Place a thick rag, like a towel, over the radiator cap, and then slowly ro-
tate the cap counterclockwise to the detent to allow any residual pres-
sure to escape. When the hissing sound has stopped, press down on the
cap while turning it counterclockwise, and then remove the cap.
TIP
If coolant is not available, tap water can be temporarily used instead, provided
that it is changed to the recommended coolant as soon as possible.
Wait until the engine
has cooled.
Check the coolant
level in the reservoir
and radiator.Add coolant.
(See TIP.)
The coolant level is
OK.
There is no leakage.
There is leakage.
The coolant level is
low.
Check the cooling
system for leakage.
Have a Yamaha
dealer check and
repair the cooling
system.
Start the engine. If the engine overheats again,
have a Yamaha dealer check and repair the cooling
system.
UB6WE0E0.book Page 37 Friday, March 27, 2020 11:37 AM

Specifications
8-1
8
*Dimensions:
Overall length:
2090 mm (82.3 in)
Overall width:
755 mm (29.7 in)
Overall height:
1070 mm (42.1 in)
Seat height:
780 mm (30.7 in)
Wheelbase:
1380 mm (54.3 in)
Ground clearance:
160 mm (6.30 in)
Minimum turning radius:
2.9 m (9.51 ft)
*Weight:
Curb weight:
169 kg (373 lb)
*Engine:
Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train:
DOHC
Cylinder arrangement:
Inline
Number of cylinders:
2-cylinder
Displacement:
321 cm3
Bore × stroke:
68.0 × 44.1 mm (2.68 × 1.74 in)
Starting system:
Electric starter
*Engine oil:
Recommended brand:
SAE viscosity grades:
10W-40
Recommended engine oil grade:
API service SG type or higher, JASO
standard MA
*Engine oil quantity:
Oil change:
1.80 L (1.90 US qt, 1.58 Imp.qt)With oil filter removal:
2.10 L (2.22 US qt, 1.85 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):
0.81 L (0.86 US qt, 0.72 Imp.qt)
*Fuel:
Recommended fuel:
Unleaded gasoline (E10 acceptable)
Octane number (RON):
90
Fuel tank capacity:
14 L (3.7 US gal, 3.1 Imp.gal)
Fuel reserve amount:
3.0 L (0.79 US gal, 0.66 Imp.gal)
*Fuel injection:
*Throttle body:
ID mark:
BR51
*Drivetrain:
*Gear ratio:
1st:
2.500 (35/14)
2nd:
1.824 (31/17)
3rd:
1.348 (31/23)
4th:
1.087 (25/23)
5th:
0.920 (23/25)
6th:
0.800 (24/30)
*Front tire:
Type:
Tubeless
Size:
110/70R-17M/C 54H
Manufacturer/model:
DUNLOP/GPR-300F
*Rear tire:
Type:
Tubeless
Size:
140/70R-17M/C 66H
Manufacturer/model:
DUNLOP/GPR-300
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