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Yamaha TZ250 Manual

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IGNITION SYSTEM
6-3
EC629000
FUSE INSPECTION
1. Remove:
• Fuse 1
2. Check:
• Fuse conduct
Use pocket tester (tester selector position
Ω
X 1).
Not continuous ≥ Replace fuse and check
that the wireharness is not shorted.
EC622020
SPARK GAP TEST
1. Disconnect the fuel pump coupler to pre-
vent the fuel pump operating.
2. Disconnect the spark plug cap from spark
plug.
3. 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
4. Start the engine and increase the spark
gap until misfire occurs. (for USA and CDN)
5. Move the main switch to “RUN” and rotate
the rear wheel with gear in 3rd and check
the spark gap. (except for USA and CDN)
Minimum spark gap:
5.0 mm(0.20 in)
a
EC623001
SPARK PLUG CAP INSPECTION
1. Remove:
• Spark plug cap
CC
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 Tester selector
resistance position
4~6 kΩ at
kΩ X 1
20˚C (68˚F)
?
ELEC
… 248 …


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