torque YAMAHA WHY 50 2003 Owners Manual

PERIODIC MAINTENANCE AND MINOR REPAIR
6 If the spark plug shows signs of
electrode erosion and excessive
carbon or other deposits, it should be
replaced.
Specified spark plug:
BR8HS (NGK)
Before installing a spark plug, the spark
plug gap should be measured with a
wire thickness gauge and, if necessary,
adjusted to specification.
Spark plug gap:
0.6 — 0.7 mmClean the surface of the spark plug
gasket and its mating surface, and then
wipe off any grime from the spark plug
threads.
Tightening torque:
Spark plug:
23 Nm (2.3 m
•kg)
NOTE :
If a torque wrench is not available when
installing a spark plug, a good estimate
of the correct torque is 1/4 — 1/2 turn
past finger tight. However, the spark
plug should be tightened to the
specified torque as soon as possible.
a
ZAUM0037
a Spark plug gap
EAU04228
Final transmission oil
The final transmission case must be
checked for oil leakage before each
ride. If any leakage is found, have a
Yamaha dealer check and repair the
scooter. In addition, the final transmis-
sion oil must be changed as follows at
the intervals specified in the periodic
maintenance and lubrication chart.
1. Start the engine, warm it up by
riding the scooter for several mi-
nutes, and then stop the engine.
2. Place the scooter on the
centerstand.
3. Place an oil pan under the final
transmission case to collect the
used oil.
6-6

PERIODIC MAINTENANCE AND MINOR REPAIR
64. Remove the oil filler cap and drain
bolt to drain the oil from the final
transmission case.
5. Install the final transmission oil
drain bolt, and then tighten it to
the specified torque.
Tightening torque:
Final transmission oil drain bolt:
17 Nm (1.7 m
•kg)
6. Add the specified amount of the
recommended final transmission
oil, and then install and tighten the
oil filler cap.Recommended final transmission oil:
See page 8-1.
Oil quantity:
0.11 L
EWA00062
•Make sure that no foreign
material enters the final trans-
mission case.
•Make sure that no oil gets on
the tire or wheel.
7. Check the final transmission case
for oil leakage. If oil is leaking,
check for the cause.
1
2
ZAUM0371
1. Oil filler cap
2. Oil drain bolt
EAUM0071
Cleaning the air filter element
The air filter element should be cleaned
at the intervals specified in the periodic
maintenance and lubrication chart.
Clean the air filter element more
frequently if you are riding in unusually
wet or dusty areas.
1. Remove the air filter case cover
by removing the screws.
1
ZAUM0372
1. Screws
6-7

SPECIFICATIONS
8
EAU04513
Conversion table
All specification data in this manual are listed in SI and
METRIC UNITS.
Use this table to convert METRIC unit values to IMPERIAL
unit values.
Example:
METRIC VALUE CONVERSION
FACTORIMPERIAL VALUE
2 mm 0.03937 = 0.08 in
Conversion table
METRIC SYSTEM TO IMPERIAL SYSTEM
Metric unit Conversion factor Imperial unit
Torquem•kgf
m•kgf
cm•kgf
cm•kgf
7.233 86.794 0.0723 0.8679ft•lbf
in•lbf
ft•lbf
in•lbf
Weightkg
g
2.205 0.03527lb
oz
Speed km/h
0.6214 mi/h
Distancekm
m
m
cm
mm
0.6214 3.281 1.094 0.3937 0.03937mi
ft
yd
in
in
Volume,
Capacitycc (cm3)
cc (cm3)
L (liter)
L (liter) 0.03527 0.06102 0.8799 0.2199oz (IMP liq.)
cu•in
qt (IMP liq.)
gal (IMP liq.)
Miscellaneouskg/mm
kgf/cm
2
°C
55.997 14.2234 1.8 + 32 lb/in
psi (lbf/in
2)
°F
8-4