Yamaha TZ250M1 Owner's Service Manual page 247

IGNITION SYSTEM
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)
a
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)
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)
6-3
ELEC
Tester selector
position
kΩ X X 1