engine YAMAHA TTR90 2003 Repair Manual

YAMAHA TTR90 2003 Repair Manual TTR90 2003 YAMAHA YAMAHA https://www.carmanualsonline.info/img/51/51688/w960_51688-0.png YAMAHA TTR90 2003 Repair Manual

Page 298 of 340

YAMAHA TTR90 2003 Repair Manual  
6 - 3
–+ELEC
 
IGNITION SYSTEM 
EC622001 
SPARK GAP TEST 
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester  
1  
(ignition checker  
2  
) as shown. 
 
Spark

Page 300 of 340

YAMAHA TTR90 2003 Repair Manual 6 - 4
–+ELECIGNITION SYSTEM
“ENGINE STOP” SWITCH INSPECTION
1. Inspect:
“ENGINE STOP” switch continuity
No continuous while being pushed → Replace.
Continuous while being free → Replace

Page 304 of 340

YAMAHA TTR90 2003 Repair Manual 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

Page 316 of 340

YAMAHA TTR90 2003 Repair Manual 6 - 11
–+ELEC
STARTER MOTOR
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 t

Page 322 of 340

YAMAHA TTR90 2003 Repair Manual –+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

Page 326 of 340

YAMAHA TTR90 2003 Repair Manual 6 - 15
–+ELECCHARGING SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION 
INSPECTION
1. Check:
Couplers and leads connection
Rust/dust/looseness/short-circuit → 
Repair or replace.
CHARGING VOLTAGE IN
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