2005 YAMAHA TTR90 relay

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Page 73 of 364

YAMAHA TTR90 2005  Owners Manual SPEC
2 - 16 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/manufa

Page 116 of 364

YAMAHA TTR90 2005  Owners Manual 2 - 21
SPECCABLE ROUTING DIAGRAM
TT-R90E
1Crankcase breather hose
2CDI magneto lead
3Wire harness
4Thermo switch
5Thermo switch lead
6CDI unit lead
7Spark plug lead
8Starter cable
9Starter relay lead

Page 118 of 364

YAMAHA TTR90 2005  Owners Manual 2 - 22
SPECCABLE ROUTING DIAGRAM
1Clamp
2Engine stop switch lead
3Main switch lead
4Start switch lead
5Brake cable
6Throttle cable
7Fuel tank breather hose
8Ignition coil
9Wire harness
0Starter relay

Page 122 of 364

YAMAHA TTR90 2005  Owners Manual 2 - 24
SPEC
Fasten the starter cable, thermo
switch lead, CDI unit lead, main
switch lead, start switch lead
and engine stop switch lead.
ÒFasten the wire harness, CDI
unit leads, thermo switch le

Page 124 of 364

YAMAHA TTR90 2005  Owners Manual 2 - 25
SPEC
ÍPass the starter relay lead inside
the starter relay.
ÊPut the white tape ends within
the area as shown by the arrow.
ËMake sure that the starting cir-
cuit cut-off relay lead does not

Page 314 of 364

YAMAHA TTR90 2005  Owners Manual 6 - 2
–+ELEC
12
3
456
7
0
98
A
B
F
EC
D
ELECTRICAL COMPONENTS AND WIRING DIAGRAM
TT-R90E
EC611000
ELECTRICAL COMPONENTS
1Main switch
2“ENGINE STOP” 
switch
3Thermo switch
4Ignition coil
5CDI uni

Page 326 of 364

YAMAHA TTR90 2005  Owners Manual 6 - 7
–+ELEC
ELECTRIC STARTING SYSTEM 
(TT-R90E)
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

Page 328 of 364

YAMAHA TTR90 2005  Owners Manual –+ELEC
6 - 8 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 “BA
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