Spark Gap Test - Yamaha BR250F Service Manual

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)