2006 YAMAHA TTR50 oil

5 - 8
CHAS
Rear wheel
1. Install:Wheel bearing 1
 Spacer 2
 Wheel bearing 3
 Oil seal 4
NOTE:
Apply the lithium soap base grease on the oil
seal lip when installing.
 Install the wheel bearing with seal facing out-
ward.
 Use a socket that matches the outside diam-
eter of the race of the bearing.
 Right side of bearing shall be installed first.
 Install the oil seal with its manufacture ’s
marks or numbers facing outward.
CAUTION:
Do not strike the inner race of the bearing.
Contact should be made only with the outer
race.
New
2. Install: Rear wheel sprocket 1
 Bolts (rear wheel sprocket) 2
 Nuts (rear wheel sprocket) 3
NOTE:
Tighten the bolts in stage, using a crisscross
pattern.
1
2 4
1
3
2 3T R..25 Nm (2.5 m · kg, 18 ft · lb)
3. Install:
Rear wheel
NOTE:
Make sure that the slot a on the brake shoe
plate with the stopper b on the swingarm.
a
b
FRONT WHEEL AND REAR WHEEL

5 - 11
CHAS
REMOVAL POINTS
Handlebar grip
1. Remove:Handlebar grip 1
NOTE:
Blow in air between the handlebar or tube
guide and the grip. Then remove the grip
which has become loose.
INSPECTION
Handlebar
1. Inspect:
Handlebar 1
Bends/cracks/damage → Replace.
WARNING
Do not attempt to straighten a bent handle-
bar as this may dangerously weaken the
handlebar.
ASSEMBLY AND INSTALLATION
Handlebar
1. Install:
Starter lever 1
NOTE:
Be sure to align the flat section a of the starter
lever 1 with the flat section b of the bracket
on the handlebar
1
a
b 1
2. Install:
Left grip 1
Apply the adhesive to the handlebar 2.
NOTE:
Before applying the adhesive, wipe off
grease or oil on the handlebar surface a
with a lacquer thinner.
 Be sure to align the projection “L ” b on the
left grip with the punch mark c on the han-
dlebar.
HANDLEBAR

6 - 1
–+ELEC
345
6
78
\b0
B\f
2
1
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1 Thermo switch
2 Main switch
3 Engine stop switch
4 Ignition coil
5 Ground lead
6 Fuse
7 Battery
8 CDI unit
9 Starter relay 0
Rectifier/regulator
A Neutral switch
B AC magneto
C Carburetor heater
D Start switch
E Spark plug
F Starter motorCOLOR CODE
B ...................... Black
Br .................... Brown
O ..................... Orange
R ..................... Red
Sb .................... Sky blue
W ..................... White
Y ...................... Yellow
EC612000
WIRING DIAGRAM
R
WR
W
BL /WSb B
RW
W
W
OO
B
B
Y /R
R
W
B
R
Y /RY /R
Y
ON
OFF
OFF ON
Y
B
BY
/RRB
SbY /RR B
W
B
B
RBrR
Br
R
/WBr
R /W
L /W
OFF
RUN
Sb
BrBr
Sb
WBY
/RW SbY
B
B
B
RR
RR
R
R
R
/W
L /W
RRRB
R /W
L
/WR
R
RR
B Br
BO
R
WB
\f
2 8
4
E
1
C
D
0
63
\b F
5 7
Br
L/W .................. Blue/White
R/W .................. Red/White
Y/R ................... Yellow/Red
E
F
D
C

–+ELEC
6 - 2
IGNITION SYSTEM
EC620000
IGNITION SYSTEM
INSPECTION STEPS
Use the following steps for checking the possibility of the malfunctioning engine being attributable to
ignition system failure and for checking the spark plug which will not spark.
NOTE:
Remove the following parts before inspection.
1) Seat assembly
2) Air scoops (left and right)
3) Fuel tank
Refer to “FRONT FENDER, SEAT ASSEMBLY AND FUEL TANK ” section in the CHAPTER 4.
 Use the following special tools in this inspection.
Opama pet-4000 spark checker:
YM-34487
Ignition checker: 90890-06754Pocket tester:YU-03112-C/90890-03112
Spark gap test Clean or replace
spark plug.
Check entire ignition
system for connection. Repair or replace.
Check main switch. Replace.
Check engine stop switch. Replace.
Check ignition coil. Primary coil Replace. Secondary coil Replace.
Check AC magneto. Pickup coil Replace. Replace CDI unit.
No Spark
OK
OK
OK
OK
OK
Spark
No good
No good
No good
No good
No good
No good

6 - 4
–+ELECIGNITION SYSTEM
ENGINE STOP SWITCH INSPECTION
1. Inspect:
Engine stop switch continuity
Continuous in the “” position → Replace.
Not continuous in the “” position → Replace.
Tester (+) lead
→ Black lead
1
Tester ( –) lead
→ Black lead
2
B
1 B
2 Tester selec-
tor position
Ω
× 1B
B
1 2
EC626002
IGNITION COIL INSPECTION
1. Inspect:
Primary coil resistance
Out of specification → Replace.
2. Inspect: Secondary coil resistance
Out of specification → Replace.
NOTE:
When inspecting the secondary coil resis-
tance, remove the spark plug cap.Tester (+) lead
→ Orange lead
1
Tester ( –) lead
→ Black lead
2
Primary coil
resistance Tester selector
position
0.32 ~ 0.48 Ω at
20 °C (68 °F) Ω

× 1
Tester (+) lead → Spark plug lead
1
Tester ( –) lead
→ Orange lead
2
Secondary coil
resistance Tester selector
position
5.68 ~ 8.52 k Ω
at 20 °C (68 °F) k
Ω
× 1
1
2
1
2

6 - 5
–+ELECIGNITION SYSTEM
AC MAGNETO INSPECTION
1. Inspect:
Pickup coil resistance
Out of specification → Replace.
Tester (+) lead → Red lead
1
Tester ( –) lead
→ White lead
2
Pickup coil
resistance Tester selector
position
248 ~ 372 Ω at
20 °C (68 °F) Ω

× 100
W
R
1 2

6 - 10
–+ELEC
STARTER MOTOR
1
3
45 6
8
2
\b
1
1
LS
New
New
T R..10 Nm (1.0 m •
kg, 7.2 ft • Ib)
7
Extent of removal:1 Starter motor disassembly
Extent of removal Order Part name Q ’ty Remarks
STARTER MOTOR REMOVAL
Preparation for removal Drain the engine oil. Refer to “ENGINE OIL REPLACEMENT ”
section in the CHAPTER 3.
Bottom cover Refer to “FRONT FENDER, SEAT
ASSEMBLY AND FUEL TANK ” section
in the CHAPTER 4.
1 Starter motor 1 STARTER MOTOR DISASSEM-
BLY
1 Front bracket 1
2 O-ring 1
3 Brush set 1
4 Washer 1
5 Oil seal 1
6 Bearing 1
1
ELECTRIC STARTING SYSTEM

6 - 12
–+ELEC
INSPECTION AND REPAIR
1. Inspect:
Commutator
Dirt → Clean it with #600 grit sandpaper.
2. Measure: Commutator diameter a
Out of specification → Replace the
starter motor.
3. Measure: Mica undercut a
Out of specification → Scrape the mica to
the proper value (a hacksaw blade can
be ground to fit).
NOTE:
The mica insulation of the commutator must be
undercut to ensure proper operation of com-
mutator.
Commutator wear limit: 16.6 mm (0.65 in)
Mica undercut:1.35 mm (0.05 in)
4. Measure:
Armature assembly resistance (commu-
tator and insulation)
Out of specification → Replace the
starter motor.
Measurement steps:
 Measure the armature assembly resis-
tances with the pocket tester.
Pocket tester:
YU-03112-C/90890-03112
Armature coil:Commutator resistance 1
0.035 ~ 0.043 Ω at 20 °C (68 °F)
Insulation resistance 2
Above 1 M Ω at 20 °C (68 °F)
 If any resistance is out of specification,
replace the starter motor.
ELECTRIC STARTING SYSTEM