Ignition Timing - Yamaha BR250F Service Manual

Faulty------.. Replace.
OK
......................... Measure coil resistance.
' - - - - - . - - - _......
(See 6-1, G "Pulser and Charge Coil.")
....................... Ignition coil test (See 6-1, E "Iqnition Coil.")
OK Replace.
C.D.I.?g See 6-1, H. "C.D.1. Unit."
+
Faulty • Replace.
The engine starts but will not pick up speed.
................................. Clean or replace (See 6-1, F "Spark Plug.")
......................... Make continuity test
' - - -_ _--,--- ...J
(See 6-1, G "Pulser and Charge Coil.")
OK
................ (See 6-1 , C "lqnition Timing.")
................................ (See 6-1, H "C.D.1. Unit.")
L------------....Faulty ------.~Replace.
Dial gauge stand: 190890-01195
3. Insert the dial gauge with the needle into
the stand.
C. Ignition Timing
1. Remove the starter from the engine.
2. Remove the spark plug, and screw the
dial gauge stand into the spark plug hole.
4. Rotate the flywheel magneto until the
piston is at top-dead-center (T.D.C,).
Set the dial gauge at zero. Tighten the
set screw on the dial gauge stand to
secure the dial gauge assembly. Rotate
the flywheel back and forth to be su re
that the indicator needle does not go
past zero.
5. Starting from T.D.C., rotate the flywheel
counterclockwise until the dial gauge
reads 3-1/2 needle revolutions before
top-dead-center.
90890-03097
90890-03098 Dial gauge needle:
Dial gauge:
6-2