2003 YAMAHA TTR90 fuse

SPEC
2 - 15
Starter relay:
Model/manufacturer MS5F-751/JIDECO ----
Amperage rating 180 A ----
Coil winding resistance 4.2 ~ 4.6 Ω at 20 ˚C (68 ˚F) ----
Starting circuit cut-off relay:
Model/manufacturer ACM33221/MATSUSHITA ----
Coil winding resistance 75.69 ~ 92.51 Ω at 20 ˚C (68 ˚F) ----
Fuse (amperage × quantity):
Main fuse 10 A × 1 ----
Reserve fuse 10 A × 1 ---- Item Standard Limit
MAINTENANCE SPECIFICATIONS

2 - 7
CARACTERISTIQUES D’ENTRETIEN
SPEC

Piston:
Jeu piston-cylindre 0,025 à 0,045 mm
(0,0010 à 0,0018 in)0,15 mm
(0,0059 in)
Taille de piston “D” 46,960 à 46,975 mm
(1,8488 à 1,8494 in)----
Cote réparation de piston (2e) 47,5 mm (1,8701 in) ----
(4e) 48,0 mm (1,8898 in) ----
Point de mesure “H” 4 mm (0,16 in) ----
Décalage du piston 0,75 mm (0,0295 in) ----
Diamètre intérieur d’alésage d’axe de piston 13,002 à 13,013 mm
(0,5119 à 0,5123 in)13,045 mm
(0,5136 in)
Diamètre extérieur d’axe de piston 12,996 à 13,000 mm
(0,5117 à 0,5118 in)12,980 mm
(0,511 in)
Segments:
Segment de feu
Type Cylindrique ----
Dimensions (B
×
T) 1,0
×
2,0 mm (0,04
×
0,08 in) ----
Ecartement des becs (segment monté) 0,10 à 0,25 mm
(0,004 à 0,010 in)0,4 mm
(0,016 in)
Jeu latéral (monté) 0,030 à 0,065 mm
(0,0012 à 0,0026 in)0,12 mm
(0,005 in)
Segment d’étanchéité
Type Fuselé----
Dimensions (B
×
T) 1,0
×
2,0 mm (0,04
×
0,08 in) ----
Ecartement des becs (segment monté) 0,10 à 0,25 mm
(0,004 à 0,010 in)0,4 mm
(0,016 in)
Jeu latéral 0,020 à 0,055 mm
(0,0008 à 0,0022 in)0,12 mm
(0,005 in)
Segment racleur d’huile
Dimensions (B
×
T) 2,0
×
2,3 mm (0,08
×
0,09 in) ----
Ecartement des becs (segment monté) 0,2 à 0,7 mm (0,01 à 0,03 in) ---- Désignation Standard Limite
H
D
T
B
B
T
B
T

3 - 25
INSP
ADJ
FUSE INSPECTION
6. Install:
Battery
7. Check:
Battery terminals
Dirt → Clean with a wire brush.
Loose connection → Connect properly.
8. Lubricate:
Battery terminal
9. Connect:
Battery lead coupler
(to the battery terminals)
10. Install:
Rear fender
Seat
Recommended lubricant
Lithium soap base grease
FUSE INSPECTION
CAUTION:
To avoid a short circuit, always set the
main switch to “OFF” when checking or
replacing a fuse.
1. Remove:
Seat
Rear fender
2. Check:
Continuity
2Reserve fuse
Checking steps:
Remove the fuse 1.
Connect the pocket tester to the fuse and
check the continuity.
NOTE:
Set the pocket tester selector to “Ω × 1”.
Pocket tester
YU-03112-C/90890-03112
If the pocket tester indicates “∞”, replace
the fuse.
1 2

3 - 26
INSP
ADJ
FUSE INSPECTION
3. Replace:
Blown fuse
WARNING
Never use a fuse with an amperage rating
other than that specified. Improvising or
using a fuse with the wrong amperage rat-
ing may cause extensive damage to the
electrical system, cause the starting and
ignition systems to malfunction and could
possibly cause a fire.
4. Install:
Rear fender
Seat Replacement steps:
Set the main switch to “OFF”.
Install a new fuse of the correct amperage.
Set on the switches to verify if the electri-
cal circuit is operational.
If the fuse immediately blows again, check
the electrical circuit.
ItemsAmperage
ratingQ’ty
Main fuse 10 A 1

6 - 1
–+ELEC

12
3
456
7
0
98

A
B
F
EC
D

ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC600000
ELECTRICAL
EC610000
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
EC611000
ELECTRICAL COMPONENTS
1
Main switch
2
“ENGINE STOP”
switch
3
Thermo switch
4
Ignition coil
5
CDI unit
6
Battery
7
Rectifier/regulator
8
Neutral switch
9
CDI magneto
0
Carburetor heater
A
Starter relay
B
Fuse
C
Start switch
D
Spark plug
E
Starter motor
F
Starting circuit cut-off
relay
COLOR CODE
B ...................... Black
Br .................... Brown
G ..................... Green
O ..................... Orange
R ..................... Red
Sb .................... Sky blue
W ..................... White
Y ...................... Yellow
EC612000
WIRING DIAGRAM
G/WB/RW/LW/RBr G
RW
B/WBr BRB/WBBrR
B/WB BB
BR/WBr B
GG/W
B/W
B/W
BrB/RWWOO
B
BW/LY/RR
W
B
B
R
W/RY/R
OFF RUNB
Y/R
Y
Y
OBO BY/RYB B
Sb
W W
Sb
ON OFF
OFFON
Y
BB
Y/R
Br
Br
B
B
R
RR
R
B
R/WR/W
R/WR/W
R/W
Sb
Sb
RB
R/WB R
Y/RRB W
B/WB
R/W
R/W
R/W
Sb
9
8
1 B5
4
D
2 3
=A
E 6
C
F 7

B/R ................... Black/Red
B/W .................. Black/White
G/W.................. Green/White
R/W .................. Red/White
W/L .................. White/Blue
W/R .................. White/Red
Y/R ................... Yellow/Red

6 - 6
–+ELEC
ELECTRIC STARTING SYSTEM
STARTING CIRCUIT CUT-OFF SYSTEM
OPERATION
If the main switch is set to “ON”, the starter
motor can only operate if the following condi-
tion is met:
The transmission is in neutral (the neutral
switch is closed).
The starting circuit cut-off relay prevents the
starter motor from operating when this condi-
tion has not been met. In this instance, the
starting circuit cut-off relay is open so current
cannot reach the starter motor. When the
above condition has been met the starting cir-
cuit cut-off relay is closed and the engine can
be started by pressing the start switch.
WHEN THE TRANSMISSION IS
IN NEUTRAL
1Battery
2Main fuse
3Main switch
4Start switch
5Starting circuit cut-off relay
6Neutral switch
7Starter relay
8Starter motor
12
M
3
7
54
6 8
ELECTRIC STARTING SYSTEM

–+ELEC
6 - 7
INSPECTION STEPS
If the starter motor will not operate, use the following inspection steps.
*1 marked: Refer to “FUSE INSPECTION” section in the CHAPTER 3.
*2 marked: Refer to “BATTERY INSPECTION AND CHARGING” section in the CHAPTER 3.
*3 marked: Refer to “MAIN SWITCH INSPECTION” section.
NOTE:
Remove the following parts before inspection.
1) Seat
2) Rear fender
3) Fuel tank
Use 12 V battery in this inspection.
Use the following special tools in this inspection.
Pocket tester:
YU-3112-C/90890-03112
*1 Check fuseReplace fuse and
check wire harness.
*2 Check battery Recharge or replace.
Check each coupler and
wire connection.Repair or replace.
*3 Check main switch. Replace.
Check starter motor
operation.Repair or replace.
Check starting circuit
cut-off relay.Replace.
Check starter relay. Replace.
Check neutral switch. Replace.
Check start switch. Replace.
OK
OK
OK
OK
OK
OK
OK
OK
No good
No good
No good
No good
No good
No good
No good
No good
No good
ELECTRIC STARTING SYSTEM

–+ELEC
6 - 14
CHARGING SYSTEM
EC680000
CHARGING SYSTEM
EC681001
INSPECTION STEPS
If the battery is not charged, use the following inspection steps.
*1 marked: Refer to “FUSE INSPECTION” section in the CHAPTER 3.
*2 marked: Refer to “CHECKING AND CHARGING THE BATTERY” section in the CHAPTER 3.
NOTE:
Remove the following parts before inspection.
1) Seat
2) Rear fender
3) Fuel tank
Use the following special tool in this inspection.
Pocket tester:
YU-3112-C/90890-03112Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
*1 Check fuse.Replace fuse and
check wire harness.
*2 Check battery. Recharge or replace.
Check each coupler and
wire connection.Repair or replace.
Check charging voltage.Charging system is
good.
Check CDI magneto. Lighting coil Replace.
Replace rectifier/regulator.
OK
OK
OK
No good
OK
No good
No good
No good
No good
OK