Yamaha XVS250 2001 Service Manual page 287

EAS00743
4. Ignition spark gap
The following procedure applies to all of the
spark plugs.
D Disconnect the spark plug cap from the
spark plug.
D Connect the ignition checker
D
2 Spark plug cap
D Set the main switch to "ON".
D Measure the ignition spark gap
D Crank the engine by pushing the start switch
and gradually increase the spark gap until a
misfire occurs.
Min. ignition spark gap
6 mm
D Is there a spark and is the spark gap within
specification ?
NO
EAS00745
5. Spark plug cap resistance.
The following procedure applies to all of the
spark plug caps.
D Disconnect the spark plug cap from the
spark plug.
D Connect the pocket tester (Ω
spark plug cap as shown.
D Measure the spark plug cap resistance.
as shown.
1
a
.
YES
The ignition system
is OK.
1k) to the
IGNITION SYSTEM
Spark plug cap resistance
10 kΩ at 20_C
D Is the spark plug cap OK?
YES
EAS00747
6. Ignition coil resistance
The following procedure applies to all of the
ignition coils.
D Disconnect the ignition coil connectors from
the ignition coil terminals.
D Connect the pocket tester (Ω
ignition coil as shown.
Tester positive probe  red/black
Tester negative probe  orange (gray)
D Measure the primary coil resistance.
Primary coil resistance
3.4 X 4.6 Ω at 20_C
D Connect the pocket tester (Ω
ignition coil as shown.
D Measure the secondary coil resistance.
Tester positive probe 
Tester negative probe 
7-10
ELEC
NO
Replace the spark
plug cap.
1) to the
1k) to the
spark plug lead 1
2
Orange (gray) lead