2003 YAMAHA WHY 50 brakes

GIVE SAFETY THE RIGHT OF WAY
1
1-2
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Further safe-riding points
•Be sure to signal clearly when making turns.
•Braking can be extremely difficult on a wet road. Avoid hard braking, because the scooter could slide.
Apply the brakes slowly when stopping on a wet surface.
•Slow down as you approach a corner or turn. Once you have completed a turn, accelerate slowly.
•Be careful when passing parked cars. A driver might not see you and open a door in your path.
•Railroad crossings, streetcar rails, iron plates on road construction sites, and manhole covers become
extremely slippery when wet. Slow down and cross them with caution. Keep the scooter upright, otherwise
it could slide out from under you.
•The brake lining could get wet when you wash the scooter. After washing the scooter, check the brakes
before riding.
•Always wear a helmet, gloves, trousers (tapered around the cuff and ankle so they do not flap), and a
bright colored jacket.
•Do not carry too much luggage on the scooter. An overloaded scooter is unstable. Use a strong cord to
secure any luggage to the carrier. A loose load will affect the stability of the scooter and could divert
your attention from the road.

OPERATION AND IMPORTANT RIDING POINTS
5
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Braking
1. Close the throttle completely.
2. Apply both front and rear brakes
simultaneously while gradually
increasing the pressure.
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•Avoid braking hard or suddenly
(especially when leaning over
to one side), otherwise the
scooter may skid or overturn.
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•Railroad crossings, streetcar
rails, iron plates on road cons-
truction sites, and manhole
covers become extremely
slippery when wet. Therefore,
slow down when approaching
such areas and cross them with
caution.
•Keep in mind that braking on a
wet road is much more difficult.
Ride slowly down a hill, as
braking downhill can be very
difficult.
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Tips for reducing fuel
consumption
Fuel consumption depends largely on
your riding style. Consider the following
tips to reduce fuel consumption:
•Thoroughly warm up the engine.
Avoid high engine speeds during
acceleration.
•Avoid high engine speeds with no
load on the engine.
•Turn the engine off instead of
letting it idle for an extended length
of time (e.g., in traffic jams, at
traffic lights or at railroad
crossings).
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PERIODIC MAINTENANCE AND MINOR REPAIR
Periodic maintenance and lubrication chart ............ 6-2
Removing and installing the panel .......................... 6-5
Panel A .................................................................... 6-5
Checking the spark plug ......................................... 6-5
Final transmission oil .............................................. 6-6
Cleaning the air filter element ................................. 6-7
Adjusting the carburetor .......................................... 6-9
Adjusting the throttle cable free play ....................... 6-9
Tires ...................................................................... 6-10
Cast wheels .......................................................... 6-11
Adjusting the front brake lever free play ................ 6-12
Adjusting the front brake lever free play ................ 6-12
Checking the front brake pads .............................. 6-13
and rear brake shoes
Checking the brake fluid level ............................... 6-14
6 Changing the brake fluid ....................................... 6-15
Checking and lubricating the throttle grip .............. 6-15
and cable
Lubricating the front and rear brakes levers .......... 6-15
Checking and lubricating the centerstand ............. 6-16
Checking the front fork .......................................... 6-16
Checking the steering ........................................... 6-17
Checking the wheel bearings ................................ 6-17
Battery ................................................................... 6-18
Replacing the fuse ................................................ 6-19
Replacing a headlight bulb .................................... 6-20
Replacing the brake taillight bulb .......................... 6-21
Replacing a turn signal light bulb .......................... 6-21
Troubleshooting ..................................................... 6-22
Troubleshooting chart ............................................ 6-23

SCOOTER CARE AND STORAGE
7
Care
While the open design of a scooter
reveals the attractiveness of the
technology, it also makes it more
vulnerable. Rust and corrosion can
develop even if high-quality
components are used. A rusty exhaust
pipe may go unnoticed on a car,
however, it detracts from the overall
appearance of a scooter. Frequent and
proper care does not only comply with
the terms of the warranty, but it will also
keep your scooter 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 covers
as well as all electrical couplers
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 and
wheel axles. Always rinse the dirt
and degreaser off with water.
Cleaning
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•Avoid using strong acidic wheel
cleaners, especially on spoked
wheels. If such products 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.
•Improper 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.
•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
removers or inhibitors, brake
fluid, antifreeze or electrolyte.
•Do not use high-pressure
washers or steam-jet cleaners
since they cause water seepage
and deterioration in the following
areas: seals (of wheel and
swingarm bearings, fork and
brakes), electric components
(couplers, connectors, instru-
ments, switches and lights),
breather hoses and vents.
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SCOOTER CARE AND STORAGE
7
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•Make sure that there is no oil
or wax on the brakes or tires. If
necessary, clean the brake
discs and brake linings with a
regular brake disc cleaner or
acetone, and wash the tires with
warm water and a mild
detergent.
•Before operating the scooter
test its braking performance
and cornering behavior.
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•Apply spray oil and wax
sparingly and make sure to
wipe off any excess.
•Never apply oil or wax to any
rubber and plastic parts, but
treat them with a suitable care
product.
•Avoid using abrasive polishing
compounds as they will wear
away the paint.
NOTE :
Consult a Yamaha dealer for advice on
what products to use.
Storage
Short-term
Always store your scooter in a cool, dry
place and, if necessary, protect it
against dust with a porous cover.
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•Storing the scooter in a poorly
ventilated room or covering it
with a tarp, while it is still wet,
will allow water and humidity to
seep in and cause rust.
•To prevent corrosion, avoid
damp cellars, stables (because
of the presence of ammonia)
and areas where strong
chemicals are stored.Long-term
Before storing your scooter for several
months:
1. Follow all the instructions in the
"Care" section of this chapter.
2. Drain the carburetor float chamber
by loosening the drain bolt; this will
prevent fuel deposits from building
up. Pour the drained fuel into the
fuel tank.
3. Fill up the fuel tank and add fuel
stabilizer (if available) to prevent
the fuel tank from rusting and the
fuel from deteriorating.
4. Perform the following steps to
protect the cylinder, piston rings,
etc. from corrosion.
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SPECIFICATIONS
8
Chassis:
Frame type Steel tube underbone
Caster angle ((degree)) 25°
Trail 101.3 mm
Tires:
Front:
Type Tubeless
Size 2 1/2-16 42M
Manufacturer / Model MICHELIN / M29S TT
Rear:
Type Tubeless
Size 2 3/4-16 46M
Manufacturer / Model MICHELIN / M29S TT
Maximum load * 182 Kg
Air pressure (cold tire):
Up to 90 Kg load*
Front180 kpa
Rear 190 kpa
90 kg load — maximum
load *
Front180 kpa
Rear 210 kpa
* Total weight of rider, passenger, cargo and accessories.Wheels:
Front
Type Cast wheel
Size 16 X MT 1.60
Rear
Type Cast wheel
Size 16 X MT 1.85
Brakes:
Front
Type Single disc brake
Operation Right hand operation
Type brake fluid DOT 4
Rear
Type Single drum brake
Operation Left hand operation
Suspension:
Front suspension Telescopic fork
Rear suspension Unit swing
Shock absorber:
Front fork type Coil spring/oil damper
Rear shock absorber Coil spring/oil damper
assembly type
Wheel travel:
Front wheel travel 80 mm
Rear wheel travel 70 mm
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