2000 YAMAHA TTR90 ignition

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Page 266 of 287

YAMAHA TTR90 2000  Owners Manual –+ELEC
 
6 - 2 
IGNITION SYSTEM 
EC620000 
IGNITION SYSTEM 
EC621001 
INSPECTION STEPS 
Use the following steps for checking the possibility of the malfunctioning engine being attributable to
igniti

Page 270 of 287

YAMAHA TTR90 2000  Owners 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. 
l 
Spa

Page 272 of 287

YAMAHA TTR90 2000  Owners Manual  
6 - 4
–+ELEC
 
IGNITION SYSTEM 
EC626002 
IGNITION COIL INSPECTION 
1. Inspect: 
l 
Primary coil resistance
Out of specification  
® 
 Replace. 
Tester (+) lead  
® 
 Orange lead  
1 
 
Tester (

Page 274 of 287

YAMAHA TTR90 2000  Owners Manual 6 - 5
–+ELECIGNITION SYSTEM
2. Inspect:
lSource coil resistance
Out of specification ® Replace.
Tester (+) lead ® Brown lead 1 
Tester (–) lead ® Green lead 2 
Source coil 
resistanceTester sel

Page 280 of 287

YAMAHA TTR90 2000  Owners Manual 6 - 7
–+ELECCARBURETOR HEATING SYSTEM
EC624000
COUPLERS AND LEADS CONNECTION 
INSPECTION
1. Check:
lCouplers and leads connection
Rust/dust/looseness/short-circuit ® 
Repair or replace.
CDI MAGNETO
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