engine YAMAHA TDR 125 2001 Service Manual

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PERIODIC MAINTENANCE AND MINOR REPAIR
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9Engine overheating
EW000070
w8Do 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.
8After removing the radiator cap retaining bolt, 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.NOTE:
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.
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 NOTE.)
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.
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7-1
CareWhile the open design of a motorcy-
cle reveals the attractiveness of the
technology, it also makes it more vul-
nerable. Rust and corrosion can
develop even if high-quality compo-
nents are used. A rusty exhaust pipe
may go unnoticed on a car, however,
it detracts from the overall appear-
ance of a motorcycle. Frequent and
proper care does not only comply
with the terms of the warranty, but it
will also keep your motorcycle looking
good, extend its life and optimize its
performance.Before cleaning
1.Cover the muffler outlet with a
plastic bag after the engine has
cooled down.
2.Make sure that all caps and cov-
ers as well as all electrical cou-
plers and connectors, including
the spark plug cap, are tightly
installed.
3.Remove extremely stubborn dirt,
like oil burnt onto the crankcase,
with a degreasing agent and a
brush, but never apply such
products onto seals, gaskets,
sprockets, the drive chain and
wheel axles. Always rinse the dirt
and degreaser off with water.Cleaning
ECA00010
cC8Avoid using strong acidic
wheel cleaners, especially on
spoked wheels. If such prod-
ucts are used on hard-to-
remove dirt, do not leave the
cleaner on the affected area
any longer than instructed.
Also, thoroughly rinse the area
off with water, immediately dry
it, and then apply a corrosion
protection spray.
8Improper cleaning can damage
windshields, cowlings, panels
and other plastic parts. Use
only a soft, clean cloth or
sponge with mild detergent
and water to clean plastic.
EAU03521
MOTORCYCLE CARE AND STORAGE
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8Do 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 abra-
sive cleaning products, sol-
vent or thinner, fuel (gasoline),
rust removers or inhibitors,
brake fluid, antifreeze or elec-
trolyte.
8Do not use high-pressure
washers or steam-jet cleaners
since they cause water seep-
age and deterioration in the
following areas: seals (of
wheel and swingarm bearings,
fork and brakes), electric com-
ponents (couplers, connec-
tors, instruments, switches
and lights), breather hoses
and vents.8For motorcycles equipped
with a windshield: Do not use
strong cleaners or hard
sponges as they will cause
dulling or scratching. Some
cleaning compounds for plas-
tic may leave scratches on the
windshield. Test the product
on a small hidden part of the
windshield to make sure that it
does not leave any marks. If
the windshield is scratched,
use a quality plastic polishing
compound after 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 bottle-
brush 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
or on 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.NOTE:
Salt 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.
ECA00012
cCDo not use warm water since it
increases the corrosive action of
the salt.2.Apply a corrosion protection
spray on all metal, including
chrome- and nickel-plated, sur-
faces to prevent corrosion.
MOTORCYCLE CARE AND STORAGE
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StorageShort-term
Always store your motorcycle in a
cool, dry place and, if necessary, pro-
tect it against dust with a porous
cover.
ECA00014
cC8Storing the motorcycle in a
poorly ventilated room or cov-
ering it with a tarp, while it is
still wet, will allow water and
humidity to seep in and cause
rust.
8To 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
several months:
1.Follow all the instructions in the
ÒCareÓ section of this chapter.
2.For motorcycles equipped with a
fuel cock that has an ÒOFFÓ posi-
tion: Turn the fuel cock lever to
ÒOFFÓ.
3.Drain the carburetor float cham-
ber by loosening the drain bolt;
this will prevent fuel deposits
from building up. Pour the
drained fuel into the fuel tank.
4.Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and
the fuel from deteriorating.
5.Perform the following steps to
protect the cylinder, piston rings,
etc. from corrosion.a.Remove the spark plug cap
and spark plug.
b.Pour a teaspoonful of engine
oil into the spark plug bore.
c.Install the spark plug cap onto
the spark plug, and then place
the spark plug on the cylinder
head so that the electrodes
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 wall with
oil.)
e.Remove the spark plug cap
from the spark plug, and then
install the spark plug and the
spark plug cap.
EWA00003
wTo prevent damage or injury from
sparking, make sure to ground the
spark plug electrodes while turn-
ing the engine over.
MOTORCYCLE CARE AND STORAGE
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SPECIFICATIONS
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Specifications
ModelTDR125
Dimensions
Overall length2,120 mm
(F, GB, IRL, B, P, GR, E)
2,185 mm (S, SF, D, CH, A)
Overall width840 mm
Overall height1,295 mm
Seat height850 mm
Wheel base1,405 mm
Ground clearance270 mm
Minimum turning radius2,200 mm
Basic weight (with oil and full
fuel tank)135 kg
136 kg (CH, A)
Engine
Engine typeLiquid cooled 2-stroke,
gasoline
Cylinder arrangementForward inclined single
cylinder
Displacement125 cm
3
Bore ´Stroke56.0 ´50.7 mm
Compression ratio6.6:1
Starting systemElectric starter
Lubrication systemSeparate lubrication
(Yamaha Autolube)Engine oil (2-cycle)
TypeYamalube 2 or equivalent
2-stroke engine oil
Capacity
Total amount1.2 L
Transmission oil
TypeSAE 10W30 SE motor oil
Capacity
Periodic oil change0.75 L
Total amount0.8 L
Cooling system capacity
(total amount)1.05 L
Air filterWet type element
Fuel
TypeRegular unleaded gasoline
Fuel tank capacity11 L
Reserve amount2.2 L
Carburetor
ManufacturerMIKUNI
Model ´quantityTM28SS ´1
EAU01038
SPECIFICATIONS
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