Yamaha TZ125M1 Owner's Service Manual page 227

IGNITION SYSTEM
EC622010
SPARK GAP TEST
1. Disconnect the spark plug cap from spark
plug.
2. Connect the dynamic spark tester 1 (igni-
tion checker 2) as shown.
• Spark plug cap 3
• Spark plug 4
A For USA and CDN
B Except for USA and CDN
3. Start the engine and increase the spark gap
until misfire occurs. (for USA and CDN)
a
4. Rotate the rear wheel with gear in 3rd and
check the spark gap. (except for USA and
CDN)
Minimum spark gap:
5 mm(0.2 in)
EC623001
SPARK PLUG CAP INSPECTION
1. Remove:
• Spark plug cap
C C CAUTION:
Do not pull the spark plug lead out of the
spark plug cap. Turn the spark plug cap
counterclockwise to remove it and clock-
wise to install it.
2. Check:
• Spark plug cap resistance
Out of specification ≥ Replace.
?
Spark plug cap
resistance
4~6 kΩ at
20˚C (68˚F)
EC624000
COUPLERS AND LEADS CONNECTION
INSPECTION
1. Check:
• Couplers and leads connection
Rust/ Dust/ Looseness/Short-circuit ≥
Repair or replace.
6-3
ELEC
Tester selector
position
kΩ X X 1