2016 YAMAHA MT-25 coolant

Periodic maintenance and adjustment
6-13
6
4. Install the reservoir cap, and then
install the coolant reservoir cover
by installing the bolts.
EAU33032
Changing the coolant
The coolant must be changed at the in-
tervals specified in the periodic main-
tenance and lubrication chart. Have a
Yamaha dealer change the coolant.
WARNING! Never attempt to remove
the radiator cap when the engine is
hot.
[EWA10382]EAUN1172
Replacing the air filter ele-
ment and cleaning the check
hoseThe air filter element should be re-
placed at the intervals specified in the
periodic maintenance and lubrication
chart. Replace the air filter element
more frequently if you are riding in un-
usually wet or dusty areas. In addition,
the air filter check hose must be fre-
quently checked and cleaned if neces-
sary.
To replace the air filter element
1. Remove the rider seat. (See page
3-16.)
2. Remove the left side panel bolts.3. Remove the left side panel by re-
moving the lower projection on the
panel from the slot, and then re-
moving the upper projection as
shown.
1. Coolant reservoir capCoolant reservoir capacity (up to
the maximum level mark):
0.25 L (0.26 US qt, 0.22 Imp.qt)
1
1. Left side panel
2. Bolt
1. Projection
1
2
1
UB04E0E0.book Page 13 Wednesday, September 2, 2015 3:51 PM

Periodic maintenance and adjustment
6-39
6Engine 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 rotate the cap counterclockwise to the
detent to allow any residual pressure to escape. When the hissing sound has stopped, press down on the cap
while turning it counterclockwise, and then remove the cap.TIPIf coolant is not available, tap water can be temporarily used instead, provided that it is changed to the recommended cool-
ant as soon as possible.
Wait until the
engine has cooled.
Check the coolant level in the
reservoir and radiator.
The coolant level
is OK.The coolant level is low.
Check the cooling system
for leakage.
Have a Yamaha dealer checkand repair the cooling system.Add coolant. (See TIP.)
Start the engine. If the engine overheats again,
have a
Yamaha dealer check
and repair the cooling system.
There is
leakage.
There is
no leakage.
UB04E0E0.book Page 39 Wednesday, September 2, 2015 3:51 PM

Specifications
8-1
8
Dimensions:Overall length:
2090 mm (82.3 in)
Overall width:
745 mm (29.3 in)
Overall height:
1035 mm (40.7 in)
Seat height:
780 mm (30.7 in)
Wheelbase:
1380 mm (54.3 in)
Ground clearance:
160 mm (6.30 in)
Minimum turning radius:
2.7 m (8.86 ft)Weight:Curb weight:
165 kg (364 lb)Engine:Combustion cycle:
4-stroke
Cooling system:
Liquid cooled
Valve train:
DOHC
Cylinder arrangement:
Inline
Number of cylinders:
2-cylinder
Displacement:
250 cm3
Bore × stroke:
60.0 × 44.1 mm (2.36 × 1.74 in)Compression ratio:
11.6 : 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
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):
0.96 L (1.01 US qt, 0.84 Imp.qt)Air filter:Air filter element:
Oil-coated paper elementFuel:Recommended fuel:
Regular unleaded gasoline (Gasohol [E10]
acceptable)
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:
1WD1 00Spark plug(s):Manufacturer/model:
NGK/CR9E
Spark plug gap:
0.7–0.8 mm (0.028–0.031 in)Clutch:Clutch type:
Wet, multiple-discDrivetrain:Primary reduction ratio:
3.043 (70/23)
Final drive:
Chain
Secondary reduction ratio:
3.071 (43/14)
Transmission type:
Constant mesh 6-speed
Gear ratio:
1st:
2.667 (40/15)
2nd:
1.882 (32/17)
3rd:
1.455 (32/22)
4th:
1.200 (30/25)
5th:
1.037 (28/27)
UB04E0E0.book Page 1 Wednesday, September 2, 2015 3:51 PM

10-1
10
Index
AAir filter element and check hose,
replacing and cleaning ....................... 6-13
Auxiliary light ........................................ 6-31BBattery .................................................. 6-28
Brake and clutch levers,
checking and lubricating .................... 6-25
Brake and shift pedals,
checking and lubricating .................... 6-24
Brake fluid, changing............................ 6-21
Brake fluid level, checking.................... 6-20
Brake lever............................................ 3-12
Brake lever free play, checking ............ 6-18
Brake light switches ............................. 6-19
Brake pedal .......................................... 3-12CCables, checking and lubricating ......... 6-24
Care ........................................................ 7-1
Catalytic converter ............................... 3-15
Clutch lever........................................... 3-11
Clutch lever free play, adjusting ........... 6-17
Coolant ................................................. 6-12DDimmer switch...................................... 3-11
Drive chain, cleaning and lubricating ... 6-23
Drive chain slack .................................. 6-21EEngine break-in ...................................... 5-3
Engine oil and oil filter cartridge ............. 6-9
Engine serial number .............................. 9-1
Engine stop switch ............................... 3-11
Engine trouble warning light ................... 3-3
FFront and rear brake pads, checking ... 6-19
Front fork, checking ............................. 6-26
Fuel ...................................................... 3-13
Fuel consumption, tips for reducing ...... 5-3
Fuel tank breather hose and
overflow hose..................................... 3-15
Fuel tank cap........................................ 3-13
Fuses, replacing ................................... 6-29HHandlebar switches ............................. 3-10
Headlight bulb, replacing ..................... 6-30
Helmet holders ..................................... 3-17
High beam indicator light ....................... 3-2
Horn switch .......................................... 3-11IIdentification numbers ........................... 9-1
Ignition circuit cut-off system .............. 3-20
Indicator lights and warning lights ......... 3-2LLicense plate light bulb, replacing ....... 6-32
Luggage strap holders ......................... 3-19MMain switch/steering lock ...................... 3-1
Maintenance and lubrication,
periodic ................................................ 6-4
Maintenance, emission control
system ................................................. 6-3
Matte color, caution ............................... 7-1
Model label............................................. 9-1
Multi-function meter unit ........................ 3-4NNeutral indicator light ............................. 3-2
OOil pressure warning light ....................... 3-2PParking.................................................... 5-4
Part locations.......................................... 2-1
Pass switch........................................... 3-11SSafety information................................... 1-1
Seats ..................................................... 3-16
Shifting.................................................... 5-2
Shift pedal............................................. 3-12
Shift timing indicator light ....................... 3-3
Shock absorber assembly, adjusting ... 3-18
Sidestand.............................................. 3-19
Sidestand, checking and lubricating .... 6-26
Spark plugs, checking ............................ 6-8
Specifications ......................................... 8-1
Starting the engine ................................. 5-1
Start switch ........................................... 3-11
Steering, checking ................................ 6-27
Storage ................................................... 7-4
Storage compartment........................... 3-18
Supporting the motorcycle ................... 6-33
Swingarm pivots, lubricating ................ 6-26TTail/brake light ...................................... 6-31
Throttle grip and cable,
checking and lubricating .................... 6-24
Throttle grip free play, checking ........... 6-15
Tires ...................................................... 6-15
Tool kit .................................................... 6-1
Troubleshooting .................................... 6-36
Troubleshooting charts ......................... 6-38
Turn signal indicator light ....................... 3-2
UB04E0E0.book Page 1 Wednesday, September 2, 2015 3:51 PM