2016 YAMAHA MT-25 fuel

Periodic maintenance and adjustment
6-36
6 To install the rear wheel
1. Install the wheel and the brake cal-
iper bracket by inserting the wheel
axle from the left-hand side.
TIPMake sure that the slot in the
brake caliper bracket is fit over the
retainer on the swingarm.
Make sure that there is enough
space between the brake pads
before installing the wheel.2. Install the drive chain onto the rear
sprocket.
3. Install the axle nut.4. Lower the rear wheel so that it is
on the ground, and then put the
sidestand down.
5. Adjust the drive chain slack. (See
page 6-21.)
6. Tighten the axle nut, and then
tighten the locknuts to the speci-
fied torques.
7. Install the drive chain puller caps.
EAU25872
TroubleshootingAlthough Yamaha motorcycles receive
a thorough inspection before shipment
from the factory, trouble may occur
during operation. Any problem in the
fuel, compression, or ignition systems,
for example, can cause poor starting
and loss of power.
The following troubleshooting charts
represent quick and easy procedures
for checking these vital systems your-
self. However, should your motorcycle
require any repair, take it to a Yamaha
dealer, whose skilled technicians have
the necessary tools, experience, and
know-how to service the motorcycle
properly.
Use only genuine Yamaha replace-
ment parts. Imitation parts may look
like Yamaha parts, but they are often
inferior, have a shorter service life and
can lead to expensive repair bills.
WARNING
EWA15142
When checking the fuel system, do
not smoke, and make sure there are
no open flames or sparks in the ar-
ea, including pilot lights from water
1. Retainer
2. Slot
1
2
Tightening torques:
Axle nut:
57 Nm (5.7 m·kgf, 41 ft·lbf)
Locknut:
16 Nm (1.6 m·kgf, 12 ft·lbf)
UB04E0E0.book Page 36 Wednesday, September 2, 2015 3:51 PM

Periodic maintenance and adjustment
6-38
6
EAU42505
Troubleshooting chartsStarting problems or poor engine performance
Check the fuel level in
the fuel tank.1. Fuel
There is enough fuel.
There is no fuel.
Check the battery.
Supply fuel.
The engine does not start.
Check the battery.
Remove the spark plugs
and check the electrodes.3. Ignition
Wipe off with a dry cloth and correct the
spark plug gaps, or replace the spark plugs.
Have a Yamaha dealer check the vehicle.
Operate the electric starter.4. Compression
There is compression.
There is no compression.
The engine does not start.
Have a Yamaha dealer check the vehicle.Have a Yamaha dealer check the vehicle.
The engine does not start.
Check the compression.
Operate the electric starter.2. Battery
The engine turns over
quickly.
The engine turns over
slowly.
The engine does not start.
Check the ignition.
The battery is good.Check the battery lead connections,
and have a Yamaha dealer charge
the battery if necessary.
DryWet
Operate the electric starter.
UB04E0E0.book Page 38 Wednesday, September 2, 2015 3:51 PM

Motorcycle care and storage
7-2
7off any detergent residue using
plenty of water, as it is harmful
to plastic parts.
Do not use any harsh chemical
products on plastic parts. Be
sure to avoid using cloths or
sponges which have been in
contact with strong or abrasive
cleaning products, solvent or
thinner, fuel (gasoline), rust re-
movers or inhibitors, brake fluid,
antifreeze or electrolyte.
Do not use high-pressure wash-
ers or steam-jet cleaners since
they cause water seepage and
deterioration in the following ar-
eas: seals (of wheel and swing-
arm bearings, fork and brakes),
electric components (couplers,
connectors, instruments,
switches and lights), breather
hoses and vents.
For motorcycles equipped with
a windshield: Do not use strong
cleaners or hard sponges as
they will cause dulling
or
scratching. Some cleaning
compounds for plastic may
leave scratches on the wind-shield. Test the product on a
small hidden part of the wind-
shield to make sure that it does
not leave any marks. If the wind-
shield is scratched, use a quality
plastic polishing compound af-
ter washing.
After normal useRemove dirt with warm water, a mild
detergent, and a soft, clean sponge,
and then rinse thoroughly with clean
water. Use a toothbrush or bottlebrush
for hard-to-reach areas. Stubborn dirt
and insects will come off more easily if
the area is covered with a wet cloth for
a few minutes before cleaning.
After riding in the rain, near the sea oron salt-sprayed roadsSince sea salt or salt sprayed on roads
during winter are extremely corrosive
in combination with water, carry out
the following steps after each ride in
the rain, near the sea or on salt-
sprayed roads.
TIPSalt sprayed on roads in the winter
may remain well into spring.1. Clean the motorcycle with cold
water and a mild detergent, after
the engine has cooled down.
NOTICE: Do not use warm wa-
ter since it increases the corro-
sive action of the salt.
[ECA10792]
2. Apply a corrosion protection spray
on all metal, including chrome-
and nickel-plated, surfaces to pre-
vent corrosion.
Cleaning the windshieldAvoid using any alkaline or strong acid
cleaner, gasoline, brake fluid, or any
other solvent. Clean the windshield
with a cloth or sponge dampened with
a mild detergent, and then wash it off
thoroughly with water. For additional
cleaning, use Yamaha Windshield
Cleaner or another high-quality wind-
shield cleaner. Some cleaning com-
pounds for plastics may leave
scratches on the windshield. Before
using such cleaners, test an area of the
UB04E0E0.book Page 2 Wednesday, September 2, 2015 3:51 PM

Motorcycle care and storage
7-4
7
EAU26183
StorageShort-term
Always store your motorcycle in a cool,
dry place and, if necessary, protect it
against dust with a porous cover. Be
sure the engine and the exhaust sys-
tem are cool before covering the mo-
torcycle.NOTICE
ECA10811
Storing the motorcycle in a
poorly ventilated room or cover-
ing it with a tarp, while it is still
wet, will allow water and humid-
ity to seep in and cause rust.
To prevent corrosion, avoid
damp cellars, stables (because
of the presence of ammonia)
and areas where strong chemi-
cals are stored.Long-term
Before storing your motorcycle for sev-
eral months:
1. Follow all the instructions in the
“Care” section of this chapter.2. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
3. Perform the following steps to
protect the cylinders, piston rings,
etc. from corrosion.
a. Remove the spark plug caps
and spark plugs.
b. Pour a teaspoonful of engine
oil into each spark plug bore.
c. Install the spark plug caps onto
the spark plugs, and then
place the spark plugs on the
cylinder head so that the elec-
trodes are grounded. (This will
limit sparking during the next
step.)
d. Turn the engine over several
times with the starter. (This will
coat the cylinder walls with oil.)
WARNING! To prevent dam-
age or injury from sparking,
make sure to ground the
spark plug electrodes while
turning the engine over.
[EWA10952]
e. Remove the spark plug caps
from the spark plugs, and then
install the spark plugs and the
spark plug caps.
4. Lubricate all control cables and
the pivoting points of all levers and
pedals as well as of the side-
stand/centerstand.
5. Check and, if necessary, correct
the tire air pressure, and then lift
the motorcycle so that both of its
wheels are off the ground. Alterna-
tively, turn the wheels a little every
month in order to prevent the tires
from becoming degraded in one
spot.
6. Cover the muffler outlet with a
plastic bag to prevent moisture
from entering it.
7. Remove the battery and fully
charge it. Store it in a cool, dry
place and charge it once a month.
Do not store the battery in an ex-
cessively cold or warm place [less
than 0 °C (30 °F) or more than 30
°C (90 °F)]. For more information
on storing the battery, see page
6-28.
UB04E0E0.book Page 4 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