Yamaha WR250F(P), Owner'S Service Manual

Page: 264 / 694

3 - 48
INSP
ADJ
IGNITION TIMING CHECK
IGNITION TIMING CHECK
1. Remove:
●
Timing mark accessing screw 1
2. Attach:
●
Timing light
●
Inductive tachometer
To the spark plug lead.
3. Check:
●
Ignition timing
Timing light:
YM-33277-A/90890-03141
Inductive tachometer:
YU-8036-B
Engine tachometer:
90890-03113
Checking steps:
●
Start the engine and let it warm up. Let the
engine run at the specified speed.
Engine speed:
1,800 ~ 2,100 r/min
●
Visually check the stationary pointer
a
is
within the firing range
b
on the rotor.
Incorrect firing range
→
Check rotor and
pickup assembly.
4. Install:
●
Timing mark accessing screw