Yamaha BR250F - Spark Gap Test

6. Slowly turn the flywheel clockwise until
the dial gauge indicates the specified
ignition timing.
Ignition timing (B.T.D.C.);
1.6 mm (0.062 in)
7. The marks on the coil plate should align
with
the timing mark on the magneto. If
not,
adjust the timing.
8. Loosen
both coil plate screws.
9.
Rotate the coil plate by using a screw-
driver
at the pry points. Align the marks
on
the coil plate with the mark on the
flywheel. Tighten the screws and torque
them to spec.
Tightening
torque:
0.65 m-kg (5 ft-Ib)
6-3
10. Remove the dial gauge stands. Reinstall
the starter and the spark plug. Torque
the plug to specification.
Tightening
torque:
2.8 m-kg (20 ft-lb)
D. Spark Gap Test
The
entire ignition system can be checked for
misfire and weak spark by using
the Electro
Tester. If
the ignition system will fire across
a specified gap,
the entire ignition system is
good. If it will
not fire across the gap, pro-
ceed with
the individual component tests
until
the problem is located.
Electro tester: 90890-03021
1. Thoroughly warm up
the engine so that
all electrical components are at operating
temperatu reo
2. Stop the engine, and connect the tester
as shown.
®
1. Electro-Tester 2. Plug wire from coil 3. Spark plug
3. Start the engine, and increase the spark
gap until misfire occurs.
Minimum spark gap: 9 mm (0.35 in)